Magnetic circular Dichroism and Faraday rotation of cesium-argon excimers and cesium dimers

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1981

OSTI ID:6314665

Islam, M A

Magnetic Circular Dichroism (MCD) and Faraday Rotation (FR) of excimer absorption bands in gases are measured to obtain the first direct information about the angular momentum quantum numbers and the angular momentum coupling schemes of excimer molecules. So far, there has been no experimental method to obtain information about the axial angular momentum and the angular momentum coupling schemes of excimer molecules. In this experiment, the MCD and the FR of cesium-argon excimer and cesium dimer absorption bands between 5000 A and 10,000 A are measured for the range of temperature from 116/sup 0/ to 355/sup 0/C. Of particular interest is the blue wing of D/sub 2/ line in cesium which has been the subject of vigorous investigation. The measured MCD data at the blue wing of D/sub 2/ line clearly shows that the assignment of /sup 2/..sigma../sub 1/2/ to this excited state assuming Hund's case (b) is a poor approximation. By a simple inspection of the MCD data, it is found that the coupling scheme is more nearly Hund's case (c) than Hynd's case (b). Several other new and interesting results are obtained. The blue wing associated with 5D transition in atomic cesium is devoid of MCD and exhibits strong MCD in the red wings. Thus, the assignment of /sup 2/..sigma../sub 1/2/ and /sup 2/..pi.. to the blue and red wings, respectively, assuming Hund's case (a) and (b), is a very good approximation. Again the yellow-green band associated with 7s-6s transition in atomic cesium shows no MCD. It is therefore also a good approximation to assign /sup 2/..sigma../sub 1/2/ to the upper state assuming Hund's case (b). Much more information can be obtained by a detailed analysis of the MCD data.

• Research Organization: Columbia Univ., New York (USA)
• OSTI ID: 6314665
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ABSORPTION SPECTRA
ALKALI METALS
ANGULAR MOMENTUM
ARGON
ATOMS
CESIUM
DATA
DICHROISM
DIMERS
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
EXPERIMENTAL DATA
FARADAY EFFECT
FLUIDS
GASES
HIGH TEMPERATURE
INFORMATION
METALS
MOLECULES
NONMETALS
NUMERICAL DATA
QUANTUM NUMBERS
RADIATIONS
RARE GASES
SPECTRA
ULTRAVIOLET RADIATION