Collinear Two-color Saturation Spectroscopy In Cn A-x (1-0) And (2-0) Bands

Forthomme, Damien

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https://hdl.handle.net/2142/50773 Copy

Description

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.

Issue Date

2014-06-17

Keyword(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.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

text

Language

English

Permalink

http://hdl.handle.net/2142/50773

DOI

https://doi.org/10.15278/isms.2014.TJ15

Copyright and License Information

Copyright 2014 by the authors. Licensed under a Creative Commons Attribution 4.0 International License. http://creativecommons.org/licenses/by/4.0/

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