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 Title: Collinear Two-color Saturation Spectroscopy In Cn A-x (1-0) And (2-0) Bands Author(s): Forthomme, Damien Contributor(s): Hall, Gregory; Sears, Trevor; McRaven, C. Subject(s): Instrument/Technique Demonstration Abstract: Hyperfine-resolved saturation spectra were measured for a selection of low and medium J rotational lines in the $A^2\Pi$–$X^2\Sigma^+$ system of CN using two copropagating laser beams tuned to transitions in the (2–0) and (1–0) bands. A bleach laser was amplitude modulated and fixed in frequency near the center of a rotational line of the (2–0) vibrational band, while a probe laser was frequency-modulated and scanned across selected lines of the (1–0) vibrational band, sharing a common lower state with the bleach laser. Locking the probe laser with a tunable radio frequency offset to a cavity that tracks the slowly drifting bleach laser greatly improved the quality of the double-resonance saturation signals, by stabilizing the relative frequency of the two beams. The sub-Doppler resonances were fit with Lorentzian line shapes having a typical full-width at half maximum of 2–3 MHz. The hyperfine spectra observed depend on the hyperfine structure within both rovibronic transitions excited, permitting the determination of hyperfine molecular constants in the $\nu$ = 2 state and the refinement of previously published values in the $\nu$ = 1 state. Four nuclear magnetic dipole and two electric quadrupole hyperfine constants were determined for each of the upper states from a fit with a weighted root mean squared error of 0.5 MHz. The vibrational dependence of these constants is weak or negligible. Acknowledgements: Work at Brookhaven National Laboratory was carried out under contract No. DE-AC02-98CH10886 with the U.S. Department of Energy and supported by its Office of Basic Energy Sciences, Division of Chemical Sciences, Geosciences and Biosciences. Issue Date: 2014-06-17 Publisher: International Symposium on Molecular Spectroscopy Citation Info: Forthomme, D.; Hall, G.; Sears, T.; McRaven, C. COLLINEAR TWO-COLOR SATURATION SPECTROSCOPY IN CN A-X (1-0) AND (2-0) BANDS. Proceedings of the International Symposium on Molecular Spectroscopy, Urbana, IL, June 16-21, 2014. DOI: 10.15278/isms.2014.TJ15 Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/50773 DOI: 10.15278/isms.2014.TJ15 Rights Information: Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/ Date Available in IDEALS: 2014-09-172015-04-14
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