Interaction of wide-band-gap single crystals with 248-nm excimer laser irradiation. IX. Photoinduced atomic desorption from cleaved NaCl(100) surfaces

Journal Article · Fri Jul 01 00:00:00 EDT 2005 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.1927701· OSTI ID:20713947

Nwe, K H; Langford, S C; Dickinson, J T ^[1]

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1. Physics Department, Washington State University, Pullman, Washington 99164-2814 (United States)

Neutral atomic sodium and chlorine emissions from cleaved, single-crystal NaCl(100) surfaces due to pulsed, 248-nm excimer laser irradiation have been characterized by time-resolved, quadrupole mass spectroscopy. At laser fluences below the threshold for optical breakdown, the resulting time-of-flight signals are consistent with particles emitted in thermal equilibrium with a laser-heated surface. Activation energy measurements made by varying the substrate temperature are consistent with F-H pair formation under UV excitation. By varying the laser fluence and estimating the effective surface temperature from the time-of-flight signals, additional activation energy measurements were made. The corresponding rate-limiting step is attributed to a thermally assisted, photoelectronic process involving atomic steps. Atomic force microscope images of surfaces irradiated at low fluences show monolayer islands that are created by the aggregation of material desorbed from steps. At somewhat higher fluences, monolayer pits due to F-center aggregation are also observed.

• OSTI ID: 20713947
• Journal Information: Journal of Applied Physics, Vol. 98, Issue 1; Other Information: DOI: 10.1063/1.1927701; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACTIVATION ENERGY
AGGLOMERATION
ATOMIC FORCE MICROSCOPY
DESORPTION
EXCIMER LASERS
EXCITATION
F CENTERS
IRRADIATION
MASS SPECTRA
MASS SPECTROSCOPY
MONOCRYSTALS
PHOTONS
QUADRUPOLES
SIGNALS
SODIUM CHLORIDES
SURFACES
THERMAL EQUILIBRIUM
TIME RESOLUTION
TIME-OF-FLIGHT METHOD
ULTRAVIOLET RADIATION