Ultraviolet absorption and photodissociation of As[sub 4]

Journal Article · Mon Mar 01 04:00:00 EST 1993 · Journal of Applied Physics; (United States)

DOI:https://doi.org/10.1063/1.353076· OSTI ID:6769677

Killeen, K P ^[1]

---

1. Sandia National Laboratories, Albuquerque, New Mexico 87185 (United States)

Ultraviolet absorption spectroscopy has been used to measure the photodissociative absorption band of As[sub 4] in the spectral range from 190 to 370 nm. The As[sub 4] absorption bands are assigned to [sup 1][ital A][sub 1][r arrow][sup 1][ital T][sub 1][sup [ital A],[ital B]] Rydberg transitions with measured cross sections of 7.8[plus minus]0.5[times]10[sup [minus]18] cm[sup 2] at 256.7 nm and 1.4[plus minus]0.1[times]10[sup [minus]17] cm[sup 2] at 193.7 nm. Photolysis of As[sub 4] is shown to yield a large As[sub 2]/As[sub 4] ratio at modest photon intensities, thus suggesting a viable nonthermal method for generation of arsenic dimers for epitaxy of III-V materials.

• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6769677
• Journal Information: Journal of Applied Physics; (United States), Journal Name: Journal of Applied Physics; (United States) Vol. 73:5; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
664200 -- Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ABSORPTION SPECTRA
ARSENIC
CHEMICAL REACTIONS
CROSS SECTIONS
DECOMPOSITION
DISSOCIATION
ELEMENTS
ENERGY LEVELS
EPITAXY
EXCITED STATES
MOLECULAR BEAM EPITAXY
PHOTOCHEMICAL REACTIONS
PHOTOLYSIS
RYDBERG STATES
SEMIMETALS
SPECTRA
ULTRAVIOLET SPECTRA