The document discusses infrared (IR) spectroscopy, which analyzes the interaction of infrared radiation with matter. IR spectroscopy can provide information about a compound's chemical structure and molecular structure by measuring its absorption of IR radiation. It is widely used to analyze organic materials and some inorganic molecules. The document then describes various components of IR instrumentation, including IR radiation sources like the Nernst glower and globar, monochromators that separate wavelengths, sample cells and techniques, and detectors like thermocouples, bolometers, and thermistors that measure the radiation absorbed.
This presentation include the detailed explanation of various parts of a UV-Visible spectrophotometer and two types of UV-Visible spectrophotometers-Single beam and Doube beam. It also include the comparison between single beam and double beam spectrophotometers.
This presentation include the detailed explanation of various parts of a UV-Visible spectrophotometer and two types of UV-Visible spectrophotometers-Single beam and Doube beam. It also include the comparison between single beam and double beam spectrophotometers.
In this slide contains Interference In Atomic Absorption Spectroscopy and applications.
Presented by: Shaik Gouse ul azam. ( department of pharmaceutical analysis.)
RIPER, anantpur.
IR SPECTROSCOPY, INTRODUCTION, PRINCIPLE, THEORY, FATE OF ABSORBED RADIATION, FERMI RESONANCE, FINGERPRINT REGION, VIBRATIONS, FACTORS AFFECTING ABSORPTION OF IR RADIATION, SAMPLING TECHNIQUES, APPLICATIONS OF IR SPECTROSCOPY.
Introduction
working principle
fragmentation process
general rules for fragmentation
general modes of fragmentation
metastable ions
isotopic peaks
applications
In this slide contains principle of IR spectroscopy and sampling techniques.
Presented by: R.Banuteja (Department of pharmaceutical analysis).
RIPER, anantpur.
This presentation gives you thorough knowledge about the IR Spectroscopy. This include basic principle, type of vibrations, factors influencing vibrational frequency, instrumentation and applications of IR Spectroscopy. This is the most widely used technique for identifying unknown functional group depending on the vibrational frequency.
Detectors are the brain of any chromatograhic system. It help us to record the chromatogram based on certain characteristics of the analyte and help us in identifying that compound both qualitatively and quantitatively.
In this slide contains Interference In Atomic Absorption Spectroscopy and applications.
Presented by: Shaik Gouse ul azam. ( department of pharmaceutical analysis.)
RIPER, anantpur.
IR SPECTROSCOPY, INTRODUCTION, PRINCIPLE, THEORY, FATE OF ABSORBED RADIATION, FERMI RESONANCE, FINGERPRINT REGION, VIBRATIONS, FACTORS AFFECTING ABSORPTION OF IR RADIATION, SAMPLING TECHNIQUES, APPLICATIONS OF IR SPECTROSCOPY.
Introduction
working principle
fragmentation process
general rules for fragmentation
general modes of fragmentation
metastable ions
isotopic peaks
applications
In this slide contains principle of IR spectroscopy and sampling techniques.
Presented by: R.Banuteja (Department of pharmaceutical analysis).
RIPER, anantpur.
This presentation gives you thorough knowledge about the IR Spectroscopy. This include basic principle, type of vibrations, factors influencing vibrational frequency, instrumentation and applications of IR Spectroscopy. This is the most widely used technique for identifying unknown functional group depending on the vibrational frequency.
Detectors are the brain of any chromatograhic system. It help us to record the chromatogram based on certain characteristics of the analyte and help us in identifying that compound both qualitatively and quantitatively.
IR spectroscopy (which is short for infrared spectroscopy) deals with the infrared region of the electromagnetic spectrum, i.e. light having a longer wavelength and a lower frequency than visible light. Infrared Spectroscopy generally refers to the analysis of the interaction of a molecule with infrared light.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
How to Create Map Views in the Odoo 17 ERPCeline George
The map views are useful for providing a geographical representation of data. They allow users to visualize and analyze the data in a more intuitive manner.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
We all have good and bad thoughts from time to time and situation to situation. We are bombarded daily with spiraling thoughts(both negative and positive) creating all-consuming feel , making us difficult to manage with associated suffering. Good thoughts are like our Mob Signal (Positive thought) amidst noise(negative thought) in the atmosphere. Negative thoughts like noise outweigh positive thoughts. These thoughts often create unwanted confusion, trouble, stress and frustration in our mind as well as chaos in our physical world. Negative thoughts are also known as “distorted thinking”.
Ethnobotany and Ethnopharmacology:
Ethnobotany in herbal drug evaluation,
Impact of Ethnobotany in traditional medicine,
New development in herbals,
Bio-prospecting tools for drug discovery,
Role of Ethnopharmacology in drug evaluation,
Reverse Pharmacology.
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
2. Infrared (IR) Spectroscopy
IR deals with the interaction of infrared radiation with matter.
The IR spectrum of a compound can provide important
information about its chemical nature and molecular structure.
Most commonly, the spectrum is obtained by measuring the
absorption of IR radiation, although infrared emission and
reflection are also used.
Widely applied in the analysis of organic materials, also useful
for polyatomic inorganic molecules and for organometallic
compounds.
3. INFRARED REGION
NEAR INFRARED or OVERTONE: 1.2 -2.5 m,
MID INFRARED or VIBRATION: 2.5 - 25 m,
FAR INFRARED or ROTATION: 25 - 400 m,
X-RAY ULTRAVIOLET INFRARED MICRO-
WAVE
RADIO FREQUENCY
Ultraviolet Visible
Vibrational
Infrared (Mid-IR)
Nuclear
magnetic
resonance
200 nm 400 nm 800 nm
2.5 m 25 m 1 m 5 m
BLUE RED
0.78-1000 ɥM
4. ORGANIC STRUCTURE DETERMINATION
How do we know
How atoms are connected together?
Which bonds are single, double, or triple?
What functional groups exist in the molecule?
If we have a specific stereoisomer?
6. 1. IR radiation source
Be continuous over the wavelength range used.
Cover a wide wavelength range.
Be constant over long periods of time.
7. 1. The Nernst Glower
They electrically heated to about 2000 °C.
It composed of a mixture of rare earth oxides such as zirconium
oxide (ZrO2), yttrium oxide (Y2O3) and thoria.
sealed by a platinum leads to the ends to permit electrical
connection.
Consist of cylindrical hollow rod or tube having a diameter of 1-
2 mm and length of 30 mm.
8. its lifetime depends on the operating temperature and the care
taken in handling it
It provide maximum radiation about 7100cm-1 (1.4 )
9. 2. The Globar source
The power consumption is normally higher than that of the
Nernst Glower
It provide maximum radiation about 5200cm-1 .
Heated to about 2000 °C.
It’s sintered silicon carbide rod, usually about 50 mm in length
and 5 mm in diameter
10. Less convenient to use, more expensive & less intense than
Nernst Glower.
Water cooling is needed to cool the metallic electrodes attached
to the rod
11. 4. The Mercury Arc.
In the UV and visible regions, this lamp emits atomic
Hg emission lines that are very narrow and discrete, but
emits an intense continuum in the far-IR region.
When current passes through the lamp, mercury is
vaporized, excited, and ionized, forming a plasma
discharge at high pressure.
It is a high pressure mercury arc which consist of a
quartz - jacketed tube containing Hg vapor at P > 1 atm.
Used for Far IR region (wave no<200cm-1).
12. 3. Incandescent Wire Source
Incandescent wire sources are longer lasting but
of lower intensity than the glower or globar.
A similar source is a rhodium wire heater sealed
in a ceramic cylinder.
A tightly wound spiral of nichrome wire heated
to about 1100 k by an electric current.
Lower intensity IR source but longer life than the
Globar or Nernst glower.
13. 2. MONOCHROMATORS
A. Prism:-
• Used as dispersive element.
• Constructed of various metal halide salts
• Sodium chloride is most commonly prism salt used.
• These salts are subjected to mechanical & thermal
instability or water solubility.
• Protection against damage must be continuously
exercised.
14. B. Grating
• Gratings are nothing but rulings made on some
materials like glass, quartz or alkylhalides depending
upon the instrument, The mechanism is that
diffraction produces reinforcement. The rays which
are incident upon the gratings gets reinforced with the
reflected rays.
15. Advantages over Prism:-
Made with materials like aluminium
which are not attacked by moisture.
Used over cosiderable wavelength range.
16. 3. Sample cell & Sampling of
substance
Infrared spectra may be obtained for gases, liquids or
solids (neat or in solution)
• Material containing sample must be transparent to
the IR radiation. So, the salts like NaCl, KBr are only
used.
17. A. Sampling of solids
Various techniques used for preparing solid samples are as
follows:-
1. Solid run in Solution –
• In this technique, solid sample may be dissolved in a non-
aqueous solvent.
• Provided that there is no chemical interaction with the
solvent and the solvent is not absorbed in the range to be
studied.
• A drop of solution is placed on the surface of alkali metal disc
solvent is to dryness leaving a thin film of the solute.
18. 2. Solid film technique
• If the solid is amorphous in nature.
• Then the sample is deposited on the surface of a KBr
or NaCl cell by evaporation of a solution of the solid.
• Ensured that the film is not too thick to pass the
radiation
19. 3. Pressed pellet technique
• In this technique, a small amount of finely ground solid
sample is mixed with 100 times its weight of potassium
bromide and compressed.
• To form thin transparent pellet(1-2mm thick & 1cm in
diameter) using a hydraulic press.
• These pellets are transparent to IR radiation and it is used for
analysis.
20. Advantages:-
• Kbr pellets stored for long period of time.
• Resolution of spectrum is superior.
Disadvantages:-
• Always have a band at 3450cm-1 due to OH group of
moisture.
• Due to high pressure(~25000 psig) polymorphic
changes occurs.
• Not successful for polymers. (diffcult to grind with
Kbr.)
21. 4. Mull technique
This is then mounted in a path of IR beam and the spectrum is
recorded.
A thin film is applied onto the salt plates.
In this technique, the finely crushed sample is mixed with Nujol
(mineral oil) in a marble or agate mortar, with a pestle to make
a thick paste.
22. 2. Sampling of liquids
Some salt plates are highly soluble in water, so the sample and washing reagents must
be anhydrous
For most liquids, the sample cell thickness is 0.01-0.05 mm.
The sample thickness should be selected so that the transmittance lies between 15-
20%.
Aqueous solvents cannot be used because they cannot dissolve alkali halides. Organic
solvents like chloroform can be used.
Liquid sample cells can be sandwiched using liquid sample cells of highly purified
alkali halides, normally NaCl. & KBr can also be used.
23. 3. Sampling of gases
Gas analysis are not commonly used because of lack of
sensitivity.
A sample cell with a long path length (5 – 10 cm) is needed
because the gases show relatively weak absorbance.
It is similar to the liquid sample cell.
The sample cell is made up of NaCl, KBr etc
24. DETECTORS
• The detectors can be classified into three
categories:
1. Thermal detectors:- Their responses depend upon
the heating effect of radiation .
2. Pyroelectric detectors:- Pyroelectric effect depends
on the rate of change of the detector temperature rather than
on the temperature itself.
3. Photoconducting detectors:- Most sensitive .
25. Thermocouples
If one welded joint (called the hot junction) becomes hotter than the other
joint (the cold junction), a small electrical potential develops between the
joints
A thermocouple is made by welding together at each end two wires made
from different metals.
26. Response time ~60m sec.
The potential difference generated in the wires is a function of the
temperature difference between the junctions and, therefore, of the intensity
of IR radiation falling on the hot junction.
The hot junction is xposed to the IR radiation, which increases the
temperature of the junction.
In IR spectroscopy, the cold junction is carefully screened in a protective box
and kept at a constant temperature.
27. To enhance sensitivity several thermocouples connected in series
are called a “thermopile”
28. Bolometer
Bridge remain balance.
When no radiation fall on bolometer.
A similar strip of metal used as balancing arm of bridge.
A bolometer is made one arm of Wheatstone Bridge.
It consist of thin metal conductor.
A bolometer is a type of resistance thermometer.
29. Response time ~4m sec.
Measure the intensity of radiation.
Amount of current flow.
Current flow through Galvanometer
Unbalanced, due to change in resistance.
When IR radiation fall.
30. THERMISTORS
Made of fused mixture of metal oxides.
As the temp. of mixture increases, it’s electrical
resistance decreases. (opposed to Bolometer)
Response time very slow...