Photostimulated desorption of CO from geologic calcite following 193-nm irradiation

Journal Article · Thu May 01 04:00:00 EDT 1997 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.55.13253· OSTI ID:565337

Beck, K M; Taylor, D P; Hess, W P ^[1]

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1. Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, Washington 99352 (United States)

We report the results of a photostimulated desorption study of neutral CO product from geologic calcite using very low fluence 193-nm excimer laser radiation. Detailed product state distributions are obtained using (2+1) resonance enhanced multiphoton ionization. The CO translational energy can be characterized by a temperature (T=110{plus_minus}15K) significantly lower than that of the substrate (T=295K). The CO rotational state distribution is non-Boltzmann and there is step structure every four or five rotational states. The evolution of CO emission as a function of laser exposure shows no incubation period or enhanced CO photodesorption over time. The CO yield is linear with laser power and displays no detectable threshold. The low kinetic energy of the desorbed CO and the nonthermal CO distributions implicate the decay of a surface species or state. {copyright} {ital 1997} {ital The American Physical Society}

• Research Organization: Pacific Northwest National Laboratory
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 565337
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 19 Vol. 55; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

40 CHEMISTRY
CALCITE
CARBON MONOXIDE
DESORPTION
LASER RADIATION
RADIATION EFFECTS
ROTATIONAL STATES
SORPTIVE PROPERTIES
ULTRAVIOLET RADIATION
VIBRATIONAL STATES