Infrared Spectroscopy and Its Recent Applications
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“INFRARED SPECTROSCOPY AND ITS RECENT APPLICATIONS”
JAIPUR
Submitted By : Supervised By : DEEPAK KUMAR KHANDELWAL Mr. ASHISH AGARWAL B. PHARM. Part - IVth M.PHARM.(Lecturer) Enroll. No. 06/15427 SKIP, JAIPUR SWAMI KESHVANAND INSTITUTE OF PHARMACY JAIPUR-302025
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CONTENTS
Introduction to Spectroscopy
Infrared spectroscopy
Advanced infrared spectroscopy techniques
General applications
Recent applications
Limitations
References
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Spectroscopy
Spectrum
A display of such data is called a spectrum, that is, a plot of the intensity of emitted or transmitted radiant energy (or some function of the intensity) versus the energy of that light.
Origin of spectra
The spectrum is originated from atoms ions and molecules by emitting or absorbing the energies.
Definition Spectroscopy is the study of the properties of material systems by means of their interaction with electromagnetic radiation; ordinarily the radiation is dispersed into a spectrum after passing through the material.
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Common types of spectroscopy
Atomic spectroscopy
Molecular spectroscopy
Visible
Ultraviolet
Infrared
Raman
Nuclear magnetic resonance
Electron spin
Mass
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Infrared spectroscopy
What is IR spectroscopy?
Infrared spectroscopy is the subset of spectroscopy that deals with the infrared region of the electromagnetic spectrum. It covers a range of techniques, the most common being a form of absorption spectroscopy.
Wavelength The wavelength range of infrared radiation lies between 14000–10 cm−1 (0.8–1000 μm) . The most useful I.R. region lies between 4000 - 670cm-1.
Regions
Near infrared :- approximately 14000–4000 cm−1 (0.8–2.5μm)
Mid infrared :- approximately 4000–400 cm−1 (2.5–30μm)
Far infrared :- approximately 400–10 cm−1 (30–1000 μm)
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Modes of vibrations
1. Stretching : Change in inter-atomic distance along bond axis.
Symmetrical
Asymmetrical
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2. Bending: Change in angle between two bonds. There are four types of bend.
Rocking
Wagging Twisting
Scissoring
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Instrumentation
1. Sources
2. Monochromators
3. Sample preparation
4. Detectors
5. Typical method
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1. Sources An inert solid is electrically heated to a temperature in the range 1500-2200 K. The heated material will then emit infrared radiation.
Nernst glower
Globar source
Incandescent wire source
Mercury arc
2. Monochromators
A monochromator is an optical device that transmits a mechanically selectable narrow band of wavelengths of light or other radiation chosen from a wider range of wavelengths available at the input.
Prism monochromator
Grating monochromator
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3. Sample preparation
Solid samples
Solid run in solution
Solid films
Mull techniques
Pressed pellet techniques
Liquid samples
Gaseous samples
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Thermocouples
Photoconducting
Bolometers
Thermistors
Semiconductor detector
Pyroelectric detectors
4. Detectors
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Fig:- Typical apparatus
5. Typical method
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Advanced infrared spectroscopy techniques
1. Fourier transform spectroscopy
2. Two-dimensional infrared spectroscopy
3. Nonlinear two-dimensional infrared spectroscopy
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14Fig:- Fourier transform spectrograph
1. Fourier transform spectroscopy It is a measurement technique whereby spectra are collected based on measurements of the coherence of a radiative source, using time-domain
measurements of the electromagnetic radiation.
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2. Two-dimensional infrared spectroscopy
It is a technique for 2D correlation analysis of infrared spectra by extending the spectral information of a sample. The 2D spectra represent a graphical overview of the spectral changes due to changing concentration or changing temperature as well as the relationship between the spectral changes at two different wavenumbers.
It is a technique that has become available with the development of femtosecond infrared laser pulses. In this experiment first a set of pump pulses are applied to the sample. This is followed by a waiting time, where the system is allowed to relax. The waiting time typically lasts from zero to several picoseconds and the duration can be controlled with a resolution of tens of femtoseconds. A probe pulse is then applied resulting in the emission of a signal from the sample.
3. Nonlinear two-dimensional infrared spectroscopy
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General Applications of IR spectroscopy
Identification of all types of organic compounds Identification of many types of inorganic compounds Determination of functional groups in organic materials Determination of the molecular composition of surfaces Detection of water in a sample Quantitative determination of compounds in mixtures Determination of molecular conformation Determination of molecular orientation (polymers and solutions) Identification of compounds by matching spectrum of unknown compound with
reference spectrum (fingerprinting) Identification of functional groups in unknown substance Identification of reaction components and kinetic studies of reactions Identification of molecular orientation in polymer films Detection of molecular impurities or additives present in amounts of 1% and in some
cases as low as 0.01% Identification of polymers, plastics, and resins Analysis of formulations such as insecticides and copolymers
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Examples:-
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Recent applications of IR spectroscopy
2. Atmosphere and the Environment 3. Combustion and Fire Detection
1. Imaging of human hair
4. Measuring Electric and Magnetic Fields
5. Spectroscopy and Technique Development
6. Process Monitoring and Industrial Hygiene
7. Forensic Applications
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Cuticle
Cortex
Medulla
A
B
Fig:-Images based on the absorption of the CH stretching band (collagen) (A), the Amide I band (protein) (B), of hair.
1. Imaging of human hair
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2. Atmosphere and the Environment
Airborne Humidity Measurements
By fast (25 Hz) and accurate (5%) hygrometer
Measurement of Greenhouse Gas Fluxes
NSF's HIAPER Gulfstream-V aircraft
A diode laser-based instrumentation for measurement of methane flux from natural and man-made sources.
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3. Combustion and Fire Detection
Measurement of Flame Species
Real Time Imaging of Flame Species
Measurement of Combustion Radicals
4. Measuring Electric and Magnetic Fields
Frequency-resolved optical gating (FROG) uses a nonlinear optical material to slice out part of the ultrafast pulse, which is then measured with a spectrometer. A series of these slices produces an interferogram, which characterizes the time-dependent spectrum of the pulse.
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5. Spectroscopy and Technique Development
Detection of Ammonia and Nitric Oxide Using Antimonide Diode Lasers
1. Nitric oxide (NO) in the 2650 nm region. 2. Ammonia (NH3) in the 2220 nm region
Diode Laser Absorption
Using this technique, we have demonstrated an absorption detection sensitivity equivalent to measuring a change of one part in one ten-millionth of the laser intensity. This high sensitivity provides a capability for measurement of very small trace gas concentrations (sub-ppm or even sub-ppb).
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6. Process Monitoring and Industrial Hygiene
Semiconductor Process Gas Purity
Fig:-Near-IR diode laser
Perimeter Monitors for Hazardous Gases
A prototype diode laser-based instrumentation for perimeter monitoring of hazardous gases (e.g. hydrogen fluoride or hydrogen sulfide) in refineries or chemical plants (i.e. prototype HF monitor).
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7. Forensic Applications
Analyzing Alcohol By a CMI INTOXILIZER
Analyzing Fibers Analyzing Drugs
Analyzing Paint
Heroine
cocaine
exp:-polyester, nylon, or acrylic
car, or on a weapon or someone's clothing or a room
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Limitations
General
• Minimal elemental information is given for most samples.
• Background solvent or solid matrix must be relatively transparent in the spectral region of
interest.
• Molecule must be active in the IR region.
Accuracy
In analysis of mixtures under favorable conditions, accuracy is greater than 1%. In routine
analyses, it is ± 5%.
Sensitivity and Detection Limits
Routine is 2%; under most favorable conditions and special techniques, it is 0.01%.
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References:-
1. Robert d. Braun ; “Introduction to instrumental Analysis”; Pharmamed Press Publishers; Indian Reprint edition-2006; P.no.-346-408.
2. Gurdeep R. Chatwal, Sham K. Anand; “Instrumental method of chemical Analysis”; Himalaya publishing house , Mumbai; Fifth edition-2002,Rprint-2008; p. no. 2.29-2.82.
3. http://en.wikipedia.Org/wiki/IR Spectroscopy;06/08/09.
4. http://en.wikipedia.Org/wiki/F.T. Spectroscopy;06/08/09.
5. http://www.cem.msu /edu/~reusch/virtual text/spectroscopy/IR.htm;12/08/09.
6. http://teaching.shu.ac.uk/hwb/chemistry/tutorials/malspec/IR spec1.htm;12/08/09.
7. http://www.prenhall.com/settle/chapters/ch.15.pdf;15/08/09.
8. http://www.answers.com/topic/IR-spectroscopy;15/08/09.
9. http://www. answers.com/spectroscopy;15/08/09.
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10. http://en.wikipedia.Org/wiki/IR Spectroscopy/correlation table;24/08/09.
11. http://www.che.isu.edu/courses/4205/2000/hendren/application.html;24/08/09.
12. http://www.ijvs.com/volume2/edition4/section1.html;02/09/09.
13. http://www.chem.uga.edu/dluhy/pages/IR_spe_ip.htm;02/09/09.
14. http://orgchem.colorado.edu/hndbooks support/IR tutor/tutorial.html;11/09/09.
15. http://www. Swsciences.com/research opps.html;11/09/09.
16. http://en.wikipedia.org/wiki/Monochromators;14/09/09.
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Thanks for your kind
attention
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QUERIES????