Introduction to spectral line shapes theory 7404-INSPELIS
The course introduces basic information on the interaction of electromagnetic radiation with matter. It is devoted to the basic methods describing the shapes of spectral lines absorbed or emitted by atoms and molecules in the gas phase. The most important concepts needed to understand the description of molecular spectra in the gas phase will be presented in the introductory level.
The course covers the following topics:
- quasi-molecule model
- approximation of binary collisions
- introduction to Jabłoński's quantum theory
- Baranger quantum theory for isolated states
- obtaining the Lorentz distribution and quantum expressions for the width and shift of spectral lines
- interpretation of expressions beyond the impact approximation
- relation of width and shift with S matrix and transition to classical expressions
- analytical expressions for the potential 1 / r ^ n
- the dependence of width on speed
- dependence of the broadening coefficients on temperature
- approach using time evolution operators
- derivation of the expressions related to the duration of the collision and the impact approximation
- inelastic collisions described by a scattering matrix
- examples of observation of collision asymmetry in a molecules
- the use of time evolution operators to describe molecular lines
- Doppler broadening
- line width and shift dependence on speed
- Voigt profile
- speed dependent Voigt profile
- velocity changing collisions
Total student workload
Learning outcomes - knowledge
Learning outcomes - skills
Learning outcomes - social competencies
Teaching methods
Expository teaching methods
- informative (conventional) lecture
- participatory lecture
Exploratory teaching methods
Online teaching methods
Type of course
Prerequisites
Course coordinators
Assessment criteria
Oral exam conducted using the Webex platform. An assessment will be issued based on student answers to three questions.
Bibliography
Profiles of line wings and rainbow satellites associated with optical and radiative collisions
By: Szudy, J.; Baylis, W.E.
Physics Reports Volume: 266 Issue: 3-4 Pages: 127-227 Published: Feb. 1996
THE EFFECT OF NEUTRAL NON-RESONANT COLLISIONS ON ATOMIC SPECTRAL-LINES
By: ALLARD, N; KIELKOPF, J
REVIEWS OF MODERN PHYSICS Volume: 54 Issue: 4 Pages: 1103-1182 Published: 1982
SIMPLIFIED QUANTUM-MECHANICAL THEORY OF PRESSURE BROADENING
By: BARANGER, M
PHYSICAL REVIEW Volume: 111 Issue: 2 Pages: 481-493 Abstract Number: A1959-01271 Published: 1958
Non-adiabatic approach to the asymmetry of pressure broadened spectral lines
By: Ciurylo, R; Szudy, J; Trawinski, RS
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER Volume: 57 Issue: 4 Pages: 551-557 Published: APR 1997
CORRELATION EFFECTS IN THEORY OF COMBINED DOPPLER AND PRESSURE BROADENING .1. CLASSICAL THEORY
By: WARD, J; COOPER, J; SMITH, EW
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER Volume: 14 Issue: 7 Pages: 555-590 Published: 1974
Additional information
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