Reinvestigation of the HCP electronic spectrum: Experimental determination of D0 for the X state and observation of hyperfine quantum beats in the B state

Article abstract of DOI:10.1063/1.464919

In the laser-induced fluorescence spectrum of HCP, a sharp decrease in fluorescence intensity was observed at 41 680 cm^-1.This diminuation in emission intensity is due to a rotationally mediated coupling of the excited vibronic level with the dissociative continuum of the <*>X state; this has allowed us to place an upper limit on D₀ for the ground electronic state.A lower limit for D₀ can be placed at 41 650 cm^-1 since strong emission was observed below this excitation energy.Using the assignments of Johns et al. as a guide, fluorescence decays were recorded from the two <*>B state vibronic bands to determine lifetimes.In addition to determining an unusually long lifetime for both states, the decays were seen to be modulated at four frequencies resulting from the coherent excitation of four nuclear hyperfine levels.This increase in lifetime and magnetic hyperfine interaction arises from a mixing of three singlet and triplet states.The contributing states are tentatively identified.

Full text of DOI:10.1063/1.464919

Reinvestigation of the HCP electronic spectrum: Experimental determination of D
0 for the X state and observation of hyperfine quantum beats in the B state
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Martin A. Mason and Kevin K. Lehmann
Citation: The Journal of Chemical Physics 98, 5184 (1993); doi: 10.1063/1.464919
View online: http://dx.doi.org/10.1063/1.464919
View Table of Contents: http://scitation.aip.org/content/aip/journal/jcp/98/7?ver=pdfcov
Published by the AIP Publishing
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This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
141.209.100.60 On: Mon, 22 Dec 2014 22:30:31

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
141.209.100.60 On: Mon, 22 Dec 2014 22:30:31

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
141.209.100.60 On: Mon, 22 Dec 2014 22:30:31

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
141.209.100.60 On: Mon, 22 Dec 2014 22:30:31

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
141.209.100.60 On: Mon, 22 Dec 2014 22:30:31

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
141.209.100.60 On: Mon, 22 Dec 2014 22:30:31

This article is copyrighted as indicated in the article. Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to IP:
141.209.100.60 On: Mon, 22 Dec 2014 22:30:31