Sub-Doppler spectroscopy of mixed state levels in CH2.

Authors :: Chang, Chih-Hsuan
Hall, Gregory E.
Sears, Trevor J.
Source :: Journal of Chemical Physics; 10/14/2010, Vol. 133 Issue 14, p144310, 6p, 1 Diagram, 1 Chart, 4 Graphs
Publication Year :: 2010
Abstract: Perturbations in the 7<subscript>16</subscript> and 8<subscript>18</subscript> mixed singlet/triplet levels of ã <superscript>1</superscript>A<subscript>1</subscript>(0,0,0) methylene, CH<subscript>2</subscript>, have been reinvestigated by frequency-modulated laser sub-Doppler saturation spectroscopy. The hyperfine structure was completely resolved for both the predominantly singlet and the predominantly triplet components of these mixed rotational levels using b <superscript>1</superscript>B<subscript>1</subscript>-ã <superscript>1</superscript>A<subscript>1</subscript> optical transitions near 12 200 cm<superscript>-1</superscript> with megahertz resolution. The mixing coefficients were obtained from the observed hyperfine splittings and a two-level deperturbation model. The analysis also determines the energy separation of the unperturbed zero-order levels and the unperturbed hyperfine splittings for the triplet perturbing levels 6<subscript>15</subscript> X <superscript>3</superscript>B<subscript>1</subscript>(0,3,0) and 9<subscript>37</subscript> X <superscript>3</superscript>B<subscript>1</subscript>(0,2,0). [ABSTRACT FROM AUTHOR]