The document discusses Mossbauer spectroscopy, which uses the Mossbauer effect to perform nuclear gamma resonance spectroscopy. It works by detecting the recoil-free emission and absorption of gamma rays in solids. The key components are a gamma ray source, sample, collimator, and detector. Mossbauer spectroscopy can provide information about isomer shift, quadrupole splitting, and magnetic shift in samples. It has various applications in areas like steel corrosion analysis, metal alloy characterization, and thin film analysis. Limitations include non-straight gamma ray paths and non-resonant electron detection challenges.

1. Presented by :
Komal jain
M . Pharm
(PHARMACEUTICAL CHEMISTRY)

2. o History
o Introduction
o Mossbauer effect
o Principle
o Instrumentation
o Spectrum of cems
o Application

3. • 1957 → Rudolf Mossbauer achieved 1st
experimental observation of resonant
adsorption of γ-radiation and discovered
recoil free in solid emission.
• Discovered "Mossbauer Effects in 1958.
• Mossbauer spectroscopy is also known as
NUCLEAR GAMMA RESONANCE
SPECTROSCOPY.

5. • It is a technique of spectroscopy that uses the mossbauer
effect , which is the recoil free resonance absorption and
emission of gamma rays of solids.
No

6.  How does it work
• Nuclei in atoms undergo many energy level transitions. Changes
occur due to emission and absorption of a gamma ray.
• Energy levels are determined by the nuclei's surrounding
environment. Observed using nuclear resonance fluorescence.
• Special technique used to gauge distances between
chromophores
• Only works when separation distance is less than10nm
• The Mossbauer Effect is a process in which a nucleus emits or absorbs gamma
rays without loss of energy to a nuclear recoil.
Recoil-free emission or absorption of a gamma-ray when
the nuclei are in a solid matrix such as a crystal lattice

9.  The basic elements of the Mossbauer spectroscopy are:
1. Source
2. Sample
3. Collimator
4. Detector
5. Drive to move the source

10. • It is formed by three main parts:
• A source that moves back and forth to generate a doppler effect.
• A collimator that filters out non-parallel gamma rays and,
• A detector.

12. There are three types of nuclear interactions that are
observed are :
1. Isomer shift (IS)
2. Quadrupole shift (QS)
3. Magnetic shift (MS)

13.  General form of an isomer shift
 Single peak
 Slightly shifted from zero
 Can be positive or negative

14.  Shows two samples
 Both show quadrupole splitting
 Show how similar structures
give similar signals.

15.  In presence of a magnetic field.
 This magnetic field is often called the
hyperfine field.
 Nuclear spin moment feels a dipole
interaction through Zeeman splitting.
Zeeman splitting:
 Atomic energy levels are split into a larger number
of energy levels.
 Magnetic field applied to split energy levels.
 Spectral lines are split along with atomic energy levels.

16.  Steel corrosion analysis
 Metal alloy characterization
 Ultra thin film analysis
 Surface analysis
 Spray Deposition(SD)Technique.
 Artificial oxide films
 Surface and interface reaction
 Ion implanted layers

17.  CEMS is a highly-selective and non-destructive
method.
 Conversion electrons are very easy to detect
efficiently.
 Information on the configuration of magnetic spin in
the surface layer can be obtained.
 CEMS has become an important tool of materials
surface analysis.

18.  Loss of electron energy in their passage through
matter cannot be calculated.
 Compton scattering and the photoelectric effect
produce "non-resonant electrons".
 Electrons do not move through matter in straight
lines.
 Only windowless detectors may be used.

19.  https://wiki.umn.edu/MXP/MossbauerLabIntroduction
 MossbauerSpectroscopyinMaterialScience,MarcelMiglieri
ni, Dimitris.
 http://korek.uci.agh.edu.pl/cemsnew.html
 Mossbaueur1,StructuralInvestigation and Characterization
of Materials, Carlos familyname.
 http://phobos.chemie.uni-mainz.de/moessbauer.php.