Infrared spectroscopy (IR spectroscopy) is the spectroscopy that deals with the infrared
region of the electromagnetic spectrum, that is light with a longer wavelength and
lower frequency than visible light.
Infrared Spectroscopy is the analysis of infrared light interacting with a molecule.
Fourier transform infrared spectroscopy: advantage and disadvantage of conventional infrared spectroscopy, introduction to FTIR ,principle of FTIR, working, advantage, disadvantage and application of FTIR.
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.
In molecular spectroscopy, a Jablonski diagram is a diagram that illustrates the electronic states of a molecule and the transitions between them. The states are arranged vertically by energy and grouped horizontally by spin multiplicity.
An Infrared spectrum represents a fingerprint of a sample with absorption peaks which correspond to the frequencies of vibrations between the bonds of the atoms making up the material-Because each different material is a unique combination of atoms, no two compounds produce the exact same spectrum, therefore IR can result in a unique identification of every different kind of material!
Infrared spectroscopy (IR spectroscopy) is the spectroscopy that deals with the infrared
region of the electromagnetic spectrum, that is light with a longer wavelength and
lower frequency than visible light.
Infrared Spectroscopy is the analysis of infrared light interacting with a molecule.
Fourier transform infrared spectroscopy: advantage and disadvantage of conventional infrared spectroscopy, introduction to FTIR ,principle of FTIR, working, advantage, disadvantage and application of FTIR.
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.
In molecular spectroscopy, a Jablonski diagram is a diagram that illustrates the electronic states of a molecule and the transitions between them. The states are arranged vertically by energy and grouped horizontally by spin multiplicity.
An Infrared spectrum represents a fingerprint of a sample with absorption peaks which correspond to the frequencies of vibrations between the bonds of the atoms making up the material-Because each different material is a unique combination of atoms, no two compounds produce the exact same spectrum, therefore IR can result in a unique identification of every different kind of material!
describes the complete history, mechanisms, instrumentation(jablonski diagram), types, comparision and factors affecting, applications of fluorescence and phosphorescence and describes about quenching and stokes shift.
Nmr nuclear magnetic resonance spectroscopyJoel Cornelio
Basics of NMR. Suitable for UG and PG courses.
Includes principle, instrumentation, solvents. chemical shift and factors affecting it. Some problems. resolving agents, coupling constant and much more
Infrared spectroscopy is technique to identify the functional group of the molecule.
In Infrared spectroscopy there are two main region finger print region and functional group region. Most of the molecules identifies In the finger print region due to that it is complex region.
Now we will see the
principle of IR spectroscopy:
IR spectroscopy is vibrational energy level changes when IR radiation passes through the material.
Infrared spectroscopy (IR spectroscopy or vibrational spectroscopy) involves the interaction of infrared radiation with matter. It covers a range of techniques, mostly based on absorption spectroscopy.
Presenting a topic which is entitled: Detectors
Above topic includes:
Types of detector
phototube detector
photomultiplier tubes
silicon photodiodes
photovoltaic cells
advantages
multi-channel photon detectors
linear photodiode arrays
photodiode array
with basics of instrumentation and science technology
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Preeti Choudhary
Introduction,Instrumentation, Classification of electronic transitions, Substituent and solvent effects, Classification of electronic transitions
Substituent and solvent effects
Applications of UV Spectroscopy
UV spectral study of alkenes
UV spectral study of poylenes
UV spectral study of α, β-unsaturated carbonyl
UV spectral study of Aromatic compounds
Empirical rules for calculating λmax.
Applications of UV Spectroscopy, Empirical rules for calculating λmax.
describes the complete history, mechanisms, instrumentation(jablonski diagram), types, comparision and factors affecting, applications of fluorescence and phosphorescence and describes about quenching and stokes shift.
Nmr nuclear magnetic resonance spectroscopyJoel Cornelio
Basics of NMR. Suitable for UG and PG courses.
Includes principle, instrumentation, solvents. chemical shift and factors affecting it. Some problems. resolving agents, coupling constant and much more
Infrared spectroscopy is technique to identify the functional group of the molecule.
In Infrared spectroscopy there are two main region finger print region and functional group region. Most of the molecules identifies In the finger print region due to that it is complex region.
Now we will see the
principle of IR spectroscopy:
IR spectroscopy is vibrational energy level changes when IR radiation passes through the material.
Infrared spectroscopy (IR spectroscopy or vibrational spectroscopy) involves the interaction of infrared radiation with matter. It covers a range of techniques, mostly based on absorption spectroscopy.
Presenting a topic which is entitled: Detectors
Above topic includes:
Types of detector
phototube detector
photomultiplier tubes
silicon photodiodes
photovoltaic cells
advantages
multi-channel photon detectors
linear photodiode arrays
photodiode array
with basics of instrumentation and science technology
https://www.linkedin.com/in/preeti-choudhary-266414182/
https://www.instagram.com/chaudharypreeti1997/
https://www.facebook.com/profile.php?id=100013419194533
https://twitter.com/preetic27018281
Please like, share, comment and follow.
stay connected
If any query then contact:
chaudharypreeti1997@gmail.com
Thanking-You
Preeti Choudhary
Introduction,Instrumentation, Classification of electronic transitions, Substituent and solvent effects, Classification of electronic transitions
Substituent and solvent effects
Applications of UV Spectroscopy
UV spectral study of alkenes
UV spectral study of poylenes
UV spectral study of α, β-unsaturated carbonyl
UV spectral study of Aromatic compounds
Empirical rules for calculating λmax.
Applications of UV Spectroscopy, Empirical rules for calculating λmax.
Ultraviolet–visible spectroscopy or ultraviolet-visible spectrophotometry (UV-Vis or UV/Vis) refers to absorption spectroscopy or reflectance spectroscopy in the ultraviolet-visible spectral region. This means it uses light in the visible and adjacent ranges.
Infrared spectroscopy (IR spectroscopy or vibrational spectroscopy) is the measurement of the interaction of infrared radiation with the matter by absorption, emission, or reflection. It is used to study and identify chemical substances or functional groups in solid, liquid, or gaseous forms.
Introduction
Instrumentation
Sampling techniques
Group frequencies
Factors affecting group frequencies
Complementarity of IR and Raman spectroscopy
Applications of Infrared spectroscopy
This PPT gives viewers a complete guidance and understanding of various topics of IR spectroscopy. Highly useful to the students of Chemistry,Physics,Lifescienes and Pharmacy.
Infrared spectroscopy is one of the most important analytical technique used for determining the functional group present in both inorganic & organic compounds.
IR spectroscopy is a technique based on the vibrations of the atom of a molecule.
IR spectroscopy measures the vibrations of atoms, through which it is possible to determine the functional groups.
Presentation on laser for Physics B.Sc. students by Dr. P D Shirbhate assistant Professor, Department of Physics G S Gawande college, Umarkhed Dist Yavatmal.
Introduction to Fourier Transfer Infrared SpectroscopyRahulVerma550005
The preferred method of infrared spectroscopy is known as Fourier Transform InfraRed (FT-IR). Infrared spectroscopy involves passing IR photons through a sample. The sample absorbs some of the infrared light and passes some of it through (transmitted). The resulting spectrum depicts the sample's molecule absorption and transmission, resulting in a molecular fingerprint.
Sharpen existing tools or get a new toolbox? Contemporary cluster initiatives...Orkestra
UIIN Conference, Madrid, 27-29 May 2024
James Wilson, Orkestra and Deusto Business School
Emily Wise, Lund University
Madeline Smith, The Glasgow School of Art
Acorn Recovery: Restore IT infra within minutesIP ServerOne
Introducing Acorn Recovery as a Service, a simple, fast, and secure managed disaster recovery (DRaaS) by IP ServerOne. A DR solution that helps restore your IT infra within minutes.
This presentation, created by Syed Faiz ul Hassan, explores the profound influence of media on public perception and behavior. It delves into the evolution of media from oral traditions to modern digital and social media platforms. Key topics include the role of media in information propagation, socialization, crisis awareness, globalization, and education. The presentation also examines media influence through agenda setting, propaganda, and manipulative techniques used by advertisers and marketers. Furthermore, it highlights the impact of surveillance enabled by media technologies on personal behavior and preferences. Through this comprehensive overview, the presentation aims to shed light on how media shapes collective consciousness and public opinion.
This presentation by Morris Kleiner (University of Minnesota), was made during the discussion “Competition and Regulation in Professions and Occupations” held at the Working Party No. 2 on Competition and Regulation on 10 June 2024. More papers and presentations on the topic can be found out at oe.cd/crps.
This presentation was uploaded with the author’s consent.
Have you ever wondered how search works while visiting an e-commerce site, internal website, or searching through other types of online resources? Look no further than this informative session on the ways that taxonomies help end-users navigate the internet! Hear from taxonomists and other information professionals who have first-hand experience creating and working with taxonomies that aid in navigation, search, and discovery across a range of disciplines.
0x01 - Newton's Third Law: Static vs. Dynamic AbusersOWASP Beja
f you offer a service on the web, odds are that someone will abuse it. Be it an API, a SaaS, a PaaS, or even a static website, someone somewhere will try to figure out a way to use it to their own needs. In this talk we'll compare measures that are effective against static attackers and how to battle a dynamic attacker who adapts to your counter-measures.
About the Speaker
===============
Diogo Sousa, Engineering Manager @ Canonical
An opinionated individual with an interest in cryptography and its intersection with secure software development.
4. A little physics of electromagnetic
radiation
• Energy (E) E = hn = hc/wavelegth
– where h is Planck’s constant, c is the speed
of light, n is frequency or the number of
vibrations per second and wavelength.
• Wavenumber (n’)- given in cm-1
Wavenumber= 1/wavelength in cm
1µ=10-4cm
Energy, frequency, and wavenumber are directly proportional to each
other. & wavelength is inversely proportional. 4
5. Regions in IR
Regions Wavelength
µ
Wavenumber
Cm-1
Near- IR Region 0.8-2.5 12500-4000
Mid- IR Region 2.5-15 4000-667
Far- IR Region 15-200 667-50
Y.R.Sharma,S.Chand; Elementary Organic Spectroscopy, India edition,
2009,Pg. no. 69-70 5
6. WHAT IS IR RADIATION
• Natural infrared-
Sunlight, at an effective temperature of 5,780
kelvins, is composed of nearly thermal-
spectrum radiation that is slightly more than
half infrared.
sunlight provides an irradiance of just over 1
kilowatts per square meter at sea level. Of
this energy, 527 watts is infrared radiation,
445 watts is visible light, and 32 watts is
ultraviolet radiation.
WWW.Wikipedia.com 6
7. Principle of IR spectroscopy
Covalent bond in molecule behave as tiny
spring
The atom will not remain in fix motion with
respect to each other but the avg. distance
remain same So the vibration motion is
occured
When internal vibrational energy of molecule
matches with energy of externally applied IR,
quantized
7
8. Molecules
absorb IR
Molecule excited from lower to the higher
vibrational level
i.e. Increases the amplitude of vibration
P.S.Kalsi; Spectroscopy Of Organic Compounds, Sixth Edition:2004, Page no.-
65-68. 8
9. Vibrations
What is a vibration in a molecule?
Any change in shape of the molecule- stretching
of bonds, bending of bonds, or internal rotation
around bonds called vibration.
I R
9
10. VIBRATION
MODE
Stretching
Change in intra-
atomic distance,bond angle
remain same
Symmetr
ic
Asymmetri
c
Bending
Change in bond
angle intra atomic
distance remain same
In plane
Scissoring Rocking
Out of
plane
Wagging Twisting
I R
10Y.R.Sharma,S.Chand; Elementary Organic Spectroscopy, India edition,
2009,Pg. no. 71
14. What is mean by IR Active
Compounds??
• If the vibration transition in molecule is
capable of change in dipole moment so the
molecule is Said to be IR active
• Asymmetrical stretching/bending and internal
rotation change the dipole moment of a
molecule. Asymmetrical stretching/bending
are IR active.
• Eg- C=0,N-H,O-H etc.
I R
14
15. What is mean by IR Inactive
Compounds??
If the vibration transition in molecule is not
produce change in dipole moment so the
molecule is Said to be IR inactive
So the symmetric compound is inactive in IR
Eg. C=C, H2, N2, Cl2
All the functional groups are asymmetric so
they are detected by IR
15
16. Requirements of IR Radiation
Correct wavelength of radiation-
Natural frequency of vibration of molecule=
frequency of the incident radiation.
Eg- HCL natural frequency=2890cm-1
HCL absorbed in frequency=2890cm-1
Molecule vibrates at an increase amplitude.
Gurdeep R. Chatwal, Sham K.Anand; Instrumental Methods Of Chemical
Analysis, Enlarge edition 2002,Pg. no. 2.31-2.32
I R
16
17. • Change in Dipole moment-
There is slight positive & negative charge on
its component atoms & changing the distance
between charged atom called change in dipole
moment.
When these charge atom vibrates, they shows
change in dipole moment, & molecule absorb
IR radiation.
Gurdeep R. Chatwal, Sham K.Anand; Instrumental Methods Of Chemical
Analysis, Enlarge edition 2002,Pg. no. 2.31-2.32
I R
17
18. Practically IR Spectra
IR Spectra recorded as % transmittance of
radiation Vs frequency or wave number cm-1
100% transmittance mean no absorption means
no peak
18