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Cavity ringdown laser absorption spectroscopy and time-of-flight mass spectroscopy of jet-cooled copper silicides

Scherer, J. J. and Paul, J. B. and Collier, C. P. and Saykally, R. J. (1995) Cavity ringdown laser absorption spectroscopy and time-of-flight mass spectroscopy of jet-cooled copper silicides. Journal of Chemical Physics, 102 (13). pp. 5190-5199. ISSN 0021-9606. http://resolver.caltech.edu/CaltechAUTHORS:SCHEjcp95c

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Abstract

The cavity ringdown technique has been implemented for electronic spectroscopy of jet-cooled CuSi produced in a pulsed UV laser vaporization plasma reactor. A time-of-flight mass spectrometer is used to simultaneously monitor species produced in the supersonic expansion and allows correlation studies to be performed. Seven rotationally resolved vibronic bands have been measured near 400 nm, yielding spectroscopic constants for the 2Sigma ground and excited states. Vibronic isotope shifts, together with rotational line positions, permit the unambiguous determination of the spectral carrier and vibronic assignment. Since no ab initio studies for the CuSi molecule exist, a comparison to ab initio studies of the related NiSi molecule is presented. Time-of-flight mass spectrometric measurements indicate the facile formation of CuxSiy clusters containing multiple copper atoms, in contrast to earlier mass spectrometric work on transition metal silicides.


Item Type:Article
Additional Information:©1995 American Institute of Physics. (Received 31 October 1994; accepted 20 December 1994) This work was supported by the Air Force Office of Scientific Research (Grant No. F49620-93-1-0278). Equipment was provided by the National Science Foundation (Grant No. CHE-9123335). J. J. Scherer thanks IBM for a predoctoral fellowship awarded during part of this research work.
Subject Keywords:ABSORPTION SPECTRA; LASER SPECTROSCOPY; TIME–OF–FLIGHT METHOD; MASS SPECTROSCOPY; JETS; COOLING; COPPER SILICIDES; PLASMA; LASERS; EVAPORATION; ULTRAVIOLET RADIATION; PULSES; CORRECTIONS; ROTATIONAL STATES; VIBRONIC STATES; GROUND STATES; EXCITED STATES; ISOTOPE EFFECTS; CORRELATIONS; NICKEL SILICIDES; MOLECULAR CLUSTERS; CLUSTER EVOLUTION; ELECTRON SPECTRA
Record Number:CaltechAUTHORS:SCHEjcp95c
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:SCHEjcp95c
Alternative URL:http://dx.doi.org/10.1063/1.469244
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:4112
Collection:CaltechAUTHORS
Deposited By: Archive Administrator
Deposited On:27 Jul 2006
Last Modified:26 Dec 2012 08:57

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