scholarly journals Formation and Luminescence of Molybdenum Atoms After UV Multiphoton Excitation of Gas Phase Mo(CO)6

1992 ◽  
Vol 12 (3-4) ◽  
pp. 223-229 ◽  
Author(s):  
Yu. E. Belyayev ◽  
A. V. Dem'yanenko ◽  
A. A. Puretzky
Keyword(s):  
Gas Phase ◽  
Rydberg Atoms ◽  
Laser Excitation ◽  
Xecl Laser ◽  
Uv Laser ◽  
Delayed Luminescence ◽  
Multiphoton Excitation

The delayed luminescence of Mo atoms was observed in XeCl laser excitation of Mo(CO)6 gas. The observed luminescence was explained by production of Mo Rydberg atoms under UV laser excitation of Mo(CO)6.

scholarly journals Reactive quenching of electronically excited NO<sub>2</sub><sup>∗</sup> and NO<sub>3</sub><sup>∗</sup> by H<sub>2</sub>O as potential sources of atmospheric HO<sub><i>x</i></sub> radicals

2018 ◽  
Vol 18 (19) ◽  
pp. 14005-14015 ◽  
Author(s):  
Terry J. Dillon ◽  
John N. Crowley
Keyword(s):  
Gas Phase ◽  
Laser Excitation ◽  
Pulsed Laser ◽  
Work Rate ◽  
Rate Coefficients ◽  
Phase Reaction ◽  
Gas Phase Reaction ◽  
Upper Limit ◽  
Upper Limits ◽  
Electronically Excited

Abstract. Pulsed laser excitation of NO2 (532–647 nm) or NO3 (623–662 nm) in the presence of H2O was used to initiate the gas-phase reaction NO2∗+H2O → products (Reaction R5) and NO3∗+H2O → products (Reaction R12). No evidence for OH production in Reactions (R5) or (R12) was observed and upper limits for OH production of k5b/k5<1×10-5 and k12b/k12<0.03 were assigned. The upper limit for k5b∕k5 renders this reaction insignificant as a source of OH in the atmosphere and extends the studies (Crowley and Carl, 1997; Carr et al., 2009; Amedro et al., 2011) which demonstrate that the previously reported large OH yield by Li et al. (2008) was erroneous. The upper limit obtained for k12b∕k12 indicates that non-reactive energy transfer is the dominant mechanism for Reaction (R12), though generation of small but significant amounts of atmospheric HOx and HONO cannot be ruled out. In the course of this work, rate coefficients for overall removal of NO3∗ by N2 (Reaction R10) and by H2O (Reaction R12) were determined: k10=(2.1±0.1)×10-11 cm3 molecule−1 s−1 and k12=(1.6±0.3)×10-10 cm3 molecule−1 s−1. Our value of k12 is more than a factor of 4 smaller than the single previously reported value.

Laser excitation and emission spectra of the hexafluorobenzene cation in the gas phase

1981 ◽  
Vol 103 (2) ◽  
pp. 326-329 ◽  
Author(s):  
Trevor Sears ◽  
Terry A. Miller ◽  
V. E. Bondybey
Keyword(s):  
Gas Phase ◽  
Laser Excitation ◽  
Emission Spectra

UV Laser-Induced Gas-Phase Copolymerization of Carbon Disulfide and Ethene

2004 ◽  
Vol 25 (4) ◽  
pp. 587-591 ◽  
Author(s):  
Radmila Tomovska ◽  
Markéta Urbanová ◽  
Radek Fajgar ◽  
Zdeněk Bastl ◽  
Jan Šubrt ◽  
...  
Keyword(s):  
Gas Phase ◽  
Carbon Disulfide ◽  
Uv Laser

Investigations of Excimer Laser Effects on CVD Diamond Growth

1989 ◽  
Vol 162 ◽  
Author(s):  
Pehr E. Pehrsson ◽  
H. H. Nelson ◽  
F. G. Celii
Keyword(s):  
Gas Phase ◽  
Nucleation Site ◽  
Laser Wavelength ◽  
Diamond Growth ◽  
Uv Laser ◽  
Gas Phase Chemistry ◽  
Scanning Auger Microprobe ◽  
Novel Method ◽  
Size And Morphology ◽  
Phase Chemistry

ABSTRACTWe investigated UV laser irradiation as a method to modify the surface and gas phase chemistry in a diamond growth apparatus. In particular, attempts were made to reproduce reported laser-enhanced deposition. The variables included the laser wavelength and intensity, the precursor gas (and hence the gas-phase absorption), the flow rate, and the gas inlet orientation with respect to the filament. The samples were analyzed using optical microscopy, Scanning Electron Microscopy, the Scanning Auger Microprobe, and micro-Raman scattering. In all cases, the laser radiation suppressed or had no effect on diamond deposition in comparison to the adjacent unirradiated regions. The crystals that did grow in the irradiated regions were similar in size and morphology to those from the unirradiated areas, suggesting ablation or nucleation site blockage as possible deposition suppression mechanisms. The results suggest a novel method for diamond film patterning.

Laser excitation spectrum of OCS+, Ā 2II3/2 &_;harr X̄ 2II3/2, in the gas phase

1985 ◽  
Vol 115 (4-5) ◽  
pp. 373-377 ◽  
Author(s):  
Martin Ochsner ◽  
Masaharu Tsuji ◽  
John P. Maier
Keyword(s):  
Gas Phase ◽  
Excitation Spectrum ◽  
Laser Excitation

Nature of delayed luminescence of N-methylindole and indole in the gas phase

2007 ◽  
Vol 74 (3) ◽  
pp. 379-384
Author(s):  
N. A. Borisevich ◽  
A. A. Sukhodola ◽  
G. B. Tolstorozhev
Keyword(s):  
Gas Phase ◽  
Delayed Luminescence

Mechanism of Chromium Deposition from Cr(CO)6 by Uv Laser Light

1989 ◽  
Vol 158 ◽  
Author(s):  
R. Nowak ◽  
P. Hess
Keyword(s):  
Gas Phase ◽  
Metal Film ◽  
Film Growth ◽  
Laser Light ◽  
Film Deposition ◽  
Uv Laser ◽  
Impurity Incorporation ◽  
Metal Atoms ◽  
Chromium Films ◽  
Main Growth

ABSTRACTThe mechanism of metal film deposition from carbonyls as precursors is discussed in detail. It is shown that different species produced by UV laser irradiation in the gas phase contribute to film growth. Highly reactive species such as metal atoms may be important during the nucleation phase, whereas more stable carbonyls are responsible for the main growth process. This indicates that the main decarbonylation effect occurs at the surface. The higher level of impurity incorporation in chromium films in comparison with nickel films is explained by the relative position of the Fermi level in the d-band of Ni and Cr with respect to the 2π* level of CO, which favors CO bond dissociation in the case of chromium.

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