Behavior of phosphine in a focused CO/sub 2/ laser beam

Journal Article · Tue Apr 01 04:00:00 EST 1986 · J. Appl. Phys.; (United States)

DOI:https://doi.org/10.1063/1.337024· OSTI ID:6082665

Blazejowski, J; Lampe, F W

The energy absorption and decomposition of PH/sub 3/ in a focused CO/sub 2/ laser beam exhibit a threshold nature. The effect of laser frequency, pulse energy, pressure of PH/sub 3/, and the presence of a foreign gas (neon) on the energy absorption and decomposition threshold were studied. The absorption of radiation increases sharply at threshold and is always accompanied by a visible luminescence. All the experimental facts can be explained in terms of an electron avalanche process, driven by inverse bremsstrahlung absorption of energy from the field of a focused IR laser beam. The simplified phenomenological theory of the dielectric breakdown of gases was applied to the explanation of the threshold phenomena. The decomposition of phosphine was studied as a function of laser frequency, pressure of PH/sub 3/, and in the presence of foreign gases. The only products of the decomposition found were H/sub 2/ in the gas phase and a solid deposit PH/sub x/. The partition of hydrogen between the gas and solid phases depends on the experimental conditions. A reaction scheme is presented which accounts satisfactorily for the experimental facts.

• Research Organization: Davey Laboratory, Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802
• DOE Contract Number: AC02-76ER03416
• OSTI ID: 6082665
• Journal Information: J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 59:7; ISSN JAPIA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400500* -- Photochemistry
ABSORPTIVITY
CARBON DIOXIDE LASERS
CHEMICAL REACTIONS
CHEMISTRY
DECOMPOSITION
DISSOCIATION
ELECTROMAGNETIC RADIATION
ENERGY
FLUIDS
GAS LASERS
GASES
LASER RADIATION
LASERS
LUMINESCENCE
OPTICAL PROPERTIES
PHOSPHINES
PHOSPHORUS COMPOUNDS
PHOTOCHEMISTRY
PHYSICAL PROPERTIES
RADIATIONS
THRESHOLD ENERGY