Accession Number : ADA191410

Title :   Implications of the Trapping-Desorption and Direct Inelastic Scattering Channels on Dicke-Narrowed Lineshapes.

Descriptive Note : Technical rept.,

Corporate Author : AEROSPACE CORP EL SEGUNDO CA CHEMISTRY AND PHYSICS LAB

Personal Author(s) : Frueholz, R P ; Camparo, J C

PDF Url : ADA191410

Report Date : 12 Feb 1988

Pagination or Media Count : 28

Abstract : The Dicke-narrowed lineshape of an atom in a wall-coated, bufferless, atomic storage cell is composed of two parts, a sharp central spike and a broad underlying pedestal. To understand the pedestal shape, we find that it is necessary to account for various atom-surface scattering channels. Conversely, analysis of the pedestal shape yields information concerning these scattering channels. In particular, nearly Doppler-broadened pedestals, observed for alkali hyperfine transitions in cells with paraffin coatings, indicate that both a trapping-desorption channel and a direct inelastic/quasi-elastic channel are accessible in the atom-surface scattering process. Alternatively, the appearance of much narrower pedestals, observed in cells with dichlordimethylsilane coatings, indicates that the trapping desorption channel dominated the atom-surface scattering process. Keywords: Atomic storage cells, Microwave spectroscopy, Atomic physics, Hydrogen adsorption.

Descriptors :   *ATOMS, *MICROWAVE SPECTROSCOPY, *TRAPS, *ATOMIC SPECTROSCOPY, ALKANES, CHANNELS, COATINGS, HYDROGEN, INELASTIC SCATTERING, NUCLEAR PHYSICS, SCATTERING, SHAPE, SHARPNESS, SPIKES, SURFACES, YIELD, ADSORPTION, SPECTRAL LINES, ATOMIC SPECTRA

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE