Laser-induced fluorescence technique to monitor H/sub 2/S (PR 16023). Quarterly technical progress report, August 1, 1981-October 31, 1981

Technical Report · Mon Nov 02 04:00:00 EST 1981

OSTI ID:5828375

The objective of this research project is to develop a means for detecting H/sub 2/S at the 0.1-ppM level via laser-induced fluorescence (LIF). Because the upper electronic states of H/sub 2/S are repulsive, it is necessary to use a two-laser pump-probe technique. The first laser (ArF, 193 nm) photodissociates H/sub 2/S into HS and H. Subsequently, a probe dye laser is used to pump the HS ground-state radicals to their A/sup 2/..sigma../sup +/ state from which the radicals then fluoresce. This fluorescence signal can be related back to the H/sub 2/S concentration prior to dissociation and thus affords a real-time diagnostic for the species of interest. The quenching rate constants for DS (A-state) quenching have been measured for the major constituents present in a gasifier. These data permit us to predict the fate of HS quenching. The quenching rate constants for HS cannot be measured directly. A correlation of the HS fluorescence signal with H/sub 2/S concentration has been made.

• Research Organization: Los Alamos National Lab., NM (USA)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5828375
• Report Number(s): DOE/TIC-2002451; ON: DE82002451
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400104* -- Spectral Procedures-- (-1987)
42 ENGINEERING
424000 -- Engineering-- Pollution Control Equipment-- (1980-1989)
CHALCOGENIDES
CHEMICAL REACTIONS
COLLISIONS
DECOMPOSITION
DEUTERIUM COMPOUNDS
ELECTROMAGNETIC RADIATION
EMISSION SPECTROSCOPY
ENERGY-LEVEL TRANSITIONS
EXCITATION
FLUORESCENCE SPECTROSCOPY
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
LASER RADIATION
LASER SPECTROSCOPY
MOLECULE COLLISIONS
MONITORING
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
PHOTON COLLISIONS
PHOTON-MOLECULE COLLISIONS
RADIATIONS
RADICALS
RESEARCH PROGRAMS
SCINTILLATION QUENCHING
SPECTROSCOPY
SULFIDES
SULFUR COMPOUNDS