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Wavelength Selection Devices1. Absorption Filters 2. Interference Filters 3. Prism Monochromators 4. Grating Monochromators 5. Interferometers
1. Absorption Filters Optical material containing an absorber that permits transmission only at certain wavelengths
2. Interference Filter A “sandwich” of at least two parallel optical flats that transmit only rays that undergo constructive interference.
3. Prism Monochromator Wavelength selection device containing a movable prism.
Snell’s Law of Refractionn1sin Θ1 = n2sin Θ2
4. Grating MonochromatorWavelength selection device based on the constructive interference of light rays that have traveled different differences to reach the same point. Work via: (1) transmission, or (2) reflection
Linear Dispersion Dl Dl = f × Da = dx/dλ where: f = focal length (of monochromator) x = distance (along focal plane)
Spectral Bandpass (s or Δλ) s = RLD × w where: w = slit width (mm) s in nm Reciprocal Linear Dispersion (RLD) RLD = Dl-1 =dλ/dx nm/mm
Camera Echelle prism ICP
5. Interferometer Allows multiple wavelengths to fall on the detector simultaneously. Corrects for interference patterns to calculate the signal at different wavelengths.
Interferometer Advantages1. Fellget’s Advantage (multiplex) 2. Jacquinot’s Advantage (throughput) 3. Wavelength Accuracy
Interferometer Disadvantages1. Fellget’s Disadvantage (multiplex) 2. Low wavelengths 3. $$$ for high resolution
Spectroscopic Light Sources
Source lens Entrance slit Exit slit width, (mm) grating Concave mirrors Focal Plane Focal Length, F (mm)
Chem. 133 – 3/19 Lecture. Announcements I Lab –Term Project Proposal due today –Lab Report Set 1 Period 2 due today –Next Lab Report due 4/7 Following.
1.Stable radiation source 2.Wavelength selector 3.Transparent sample holder: cells/curvettes made of suitable material (Table 7- 2) 4.Radiation detector.
Spectroscopic Data ASTR 3010 Lecture 16 Textbook Ch. 11.
Interference and Diffraction
Essential Components of a UV-vis Spectrophotometer Monochromator Signal Processor Display Source Sample Transducer.
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Spectral Resolution and Spectrometers
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Overlapping Orders Douglas A. Skoog and James J. Leary, Principles of Instrumental Analysis, Saunders College Publishing, Fort Worth, d(sin + sin.
Astronomical Spectroscopy Notes from Richard Gray, Appalachian State, and D. J. Schroeder 1974 in “Methods of Experimental Physics, Vol. 12-Part A Optical.
5 Components Common to All Optical Spectrometers Source Transparent Sample Holder Wavelength Selector Radiation Detector Signal Processor and Readout.
4-1 Chap. 7 (Optical Instruments), Chap. 8 (Optical Atomic Spectroscopy) General design of optical instruments Sources of radiation Selection of wavelength.
Are you getting the concept? Calculate D a, D l, R d and s g for 1 st order diffraction under optimal conditions for the indicated 0.5 m grating with 100.
Part IV: Optical Spectroscopy of Solids
The Wave Nature of Light
Diffraction vs. Interference
Announcements HW set 10 due this week; covers Ch (skip 24.8) and Office hours: Prof. Kumar’s Tea and Cookies 5-6 pm today My office hours.
PHYS 1442 – Section 004 Lecture #21 Wednesday April 9, 2014 Dr. Andrew Brandt Ch 24 Wave Nature of Light Diffraction by a Single Slit or Disk Diffraction.
PART Absorption Spectrometer Dr. S. M. Condren SourceWavelength SelectorDetector Signal Processor Readout Sample.
Interference in Thin Films, final
OPTICAL COMPONENTS 9/20/11. Applications See notes.
1 Dispersion (Terminology) How do we quantify the spatial separation of wavelengths on the exit focal plane? Angular Dispersion : D a = dθ/dλ (property.
1 ATST Imager and Slit Viewer Optics Ming Liang. 2 Optical layout of the telescope, relay optics, beam reducer and imager. Optical Layouts.
9.12 Diffraction grating • Order of diffraction
Chapter 38 Diffraction Patterns and Polarization.
1308 E&M Diffraction – light as a wave Examples of wave diffraction: Water waves diffract through a small opening in the dam. Sound waves diffract through.
Copyright © 2014 John Wiley & Sons, Inc. All rights reserved.
Interference & Diffraction. Interference Like other forms of wave energy, light waves also combine with each other Interference only occurs between waves.
Chapter 23 Light. Chapter Ray Model of Light Light travels in straight lines Ray model of light - light travels in straight line paths called.
Conditions for Interference
The wave nature of light Interference Diffraction Polarization
Chapter 24 Wave Optics. General Physics Review – waves T=1/f period, frequency T=1/f period, frequency v = f velocity, wavelength v = f velocity, wavelength.
PA2001: Time and Energy Waves and Interference Light as a wave Fermat’s principle Reflection Refraction Thin Film.
Chapter 25:Optical Instruments Cameras Homework assignment : Read Chap.25, Sample exercises : 4,21,24,41,43 Principle of a camera ss’ D Intensity of.
Chem. 133 – 4/1 Lecture. Announcements I Lab –Returning Term Project Proposals (I expect to be getting boxes of supplies ready) –Returning Set 2 Period.
Wave Nature of Light Refraction Interference Young’s double slit experiment Diffraction Single slit diffraction Diffraction grating.
Diffraction by N-slits. Optical disturbance due to N slits.
24.6 Diffraction Huygen’s principle requires that the waves spread out after they pass through slits This spreading out of light from its initial line.
Light Wave Interference In chapter 14 we discussed interference between mechanical waves. We found that waves only interfere if they are moving in the.
Introduction to Infrared Spectrometry Chap 16. Quantum Mechanical Treatment of Vibrations Required to include quantized nature of E From solving the wave.
Molecular Spectrometry (UV and Visible) Part 1: Absorption.
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