PHYS 4910 Spectroscopy
Spring 2018


Approximate Schedule

Mondays Wednesdays Fridays Labs
January 26
Introduction
January/February 29
Lab reports
Propagation of Errors
31
Definition of terms, units
Dispersion and Resolving Power
2
Refractive Index and dispersion
5
Prisms
7
Prisms
air wavelengths vs vacuum wavelengths
Diffraction gratings
Ewart Optics lecture 6
9
Multibeam interference
Ewart Optics lecture 6
12
Gratings
Lab report from Feb 5 due
Assignment 2 due
14
Czerny Turner Monochromator
16
Detectors
19
Introduction to the Czerny Turner Monochromator
21
Classical Theory of Atoms
Bohr atom
Hydrogen spectrum
23
Bohr atom
Hydrogen spectrum
February/March 26
Quantum Theory of hydrogen atoms
Quantum numbers
Degeneracy
28
Perturbation theory
2 Spectrum of H, He and Ne
5
Perturbations in atoms
Relativistic effects in hydrogen atoms
7
Perturbations in atoms
Relativistic effects in hydrogen atoms
9
Perturbations in atoms
Relativistic effects in hydrogen atoms
Detector characteristics
12 14
Central Field Approximation
Spectra of the alkali atoms
Quantum defect
Ewart Atomic Physics chapter 3
16 Spectrum of H, He and Ne
19
Helium atom
Spin
Symmetric and Antisymmmetric wavefunctions
21
LS coupling
Multielectron atoms
Equivalent electrons
Ewart Atomic Physics chapters 4 and 5
23
Selection rules
Ewart Atomic Physics chapter 8
Parity
Na D lines
26
Spin orbit coupling
LS coupling
Multielectron atoms
Non equivalent electrons
Fine structure
Ewart Atomic Physics chapters 4 and 5
28 Resolving Power
Spring Break
April 9
Polarized Light
Ewart Optics lecture 10
Zeeman Effect
Ewart Atomic Physics chapter 8
11 13
Hyperfine structure
Ewart Atomic Physics chapter 6
16
Line broadening
Ewart Atomic Physics section 2.1
18
Doppler broadening
20
Pressure and natural broadening
Projects
23 25 27 Projects
April/May 30 2 4 Projects
7 9 11 Projects
14 16  Project presentations

Projects

  1. D lines of the alkali atoms - Measure the progression in the spacing of the np-n's transitions of the alkali atoms (Li -> Na -> Rb -> Cs). The energy change between the np 2P levels reflects the increasing importance of spin-orbit coupling as Z increases.
  2. Isotope Effect in Hydrogen - The difference in wavelength for the four visible Balmer lines from hydrogen and deuterium. Measures the dependence of the spin orbit coupling on the principal quantum number, n
  3. Fabry Perot Etalon - An interference device with a very high resolving power. Obtain the spectrum from a sodium lamp, a mercury lamp, and a cadmium lamp.
  4. Spectrum of molecular nitrogen - Vibrational levels of a diatomic molecule, with influence from rotational levels
  5. Gamma ray spectroscopy - Applying the principles of spectroscopy in a region of the electromagnetic spectrum well removed from the visible. Focus is on the different instrumentation, and its ability to resolve spectra
  6. Doppler free spectroscopy (report only) - Even with high resolution equipment fine details can be rendered invisible by fundamental processes which broaden spectral lines, that is they are not truly a single wavelength. Doppler free spectroscopy is one means for overcoming the effects of the Doppler Effect in gases.
  7. Spectra from ac lamps - Our instrumentation works well with light sources which have a constant output. When the output is fluctuating there are problems with the digital sampling. One possible way of addressing the problem is using a lock in amplifier
  8. Fourier transform spectroscopy (report only) - Based on the Michelson interferometer FTS can produce the spectrum of a source by measuring the interference pattern, and then using a computer algorithm to transform the interference pattern back to the spectrum.
  9. Diode Laser bandwidth
  10. Lexan and other plastic absorption