Accession Number : AD0487556

Title :   ATOMIC ABSORPTION SPECTROSCOPY.

Descriptive Note : Summary technical rept. 2 Mar 64-28 Dec 65,

Corporate Author : LITTON SYSTEMS INC MINNEAPOLIS MN APPLIED SCIENCE DIV

Personal Author(s) : Stuart, Robley V. ; Kramer, Gerhard K.

Report Date : MAY 1966

Pagination or Media Count : 108

Abstract : Sputtering in low pressure discharge has been experimentally studied both as a source of atomic vapor and as a source of resonance radiation in atomic absorption spectroscopy. The high intensity of resonance radiation emitted by sputtered atoms in a low pressure discharge interferes strongly with absorption measurements and sensitivities achieved as a vapor source are unsatisfactory for most absorption studies. Emission intensity measurements show that sputtering in a low pressure discharge provides resonance lines of much greater intensity than in hollow cathode lamps. A Fabry-Perot interferometer has been used to compare resonance lines from hollow cathode lamps with resonance lines from a low pressure discharge. Self-absorption is found in hollow cathode lamps even at low operating currents but is not found in the low pressure discharge light source. Calibration curves obtained under identical experimental conditions show that sensitivities obtained with the low pressure discharge light source in atomic absorption are equal to or better than the best obtained with hollow cathode lamps. (Author)

Descriptors :   (*ATOMIC SPECTROSCOPY, ELECTRIC DISCHARGES), ABSORPTION SPECTRA, LOW PRESSURE, SPUTTERING, GLOW DISCHARGES, DISCHARGE TUBES, MONOCHROMATIC LIGHT, DIRECT CURRENT, EMISSIVITY.

Subject Categories : Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE