Abstract
Laser-induced gratings in mixtures of O2 with CO2 were formed by excitation of the O2 molecules to the singlet state b 1 Σ + g (v′=0). Density changes from heat release and from electrostriction, and variation of electric polarizability by excitation of molecules contribute to the grating. For modeling the relaxation of the excited O2 molecules, a three-step process is assumed: Fast heat release with respect to the rotational states first, then medium fast electronic de-activation with excitation of vibrational states of the O2 and CO2 molecules, and then the final slow heat release processes. The observed temporal evolution of the diffraction efficiency of the grating agrees rather well with modeling. Average rates of the final relaxations and the value of the polarizability of the singlet state b 1 Σ + g (v′=0) are determined in this way.
Article PDF
Similar content being viewed by others
Avoid common mistakes on your manuscript.
References
R.W. Boyd, Nonlinear Optics (Academic Press, New York, 1992)
H.J. Eichler, P. Günther, D.W. Pohl, Laser-Induced Dynamic Gratings (Springer, Berlin, 1986)
B. Hemmerling, D. Kozlov, Chem. Phys. 291, 213 (2003)
B. Hemmerling, R. Bombach, W. Hubschmid, Chem. Phys. Lett. 256, 71 (1996)
W. Hubschmid, B. Hemmerling, Chem. Phys 259, 109 (2000)
W. Hubschmid, B. Hemmerling, A. Stampanoni-Panariello, J. Opt. Soc. Am. B 12, 1850 (1995)
W. Hubschmid, B. Hemmerling, A. Stampanoni-Panariello, Appl. Phys. B 62, 103 (1996)
D. Kozlov, P.P. Radi, J. Raman Spectrosc. 39, 730 (2008)
Landolt-Börnstein, Numerical Data and Functional Relationships in Science and Technology, 6th edn., vol. II/5a (Springer, Berlin, 1969)
L. Medard, Encyclopédie des Gaz (Elsevier, Amsterdam, 1976)
M. Neracher, W. Hubschmid, Appl. Phys. B 79, 783 (2004)
K.J. Ritter, T.D. Wilkerson, J. Mol. Spectrosc. 121, 1 (1987)
A. Stampanoni-Panariello, B. Hemmerling, W. Hubschmid, Phys. Rev. A 51, 655 (1995)
R. Wayne, in Singlet O 2 , vol. 1. Physical-Chemical Aspects, ed. by A.A. Frimer (CRC Press, Boca Raton, 1985)
Y. Yan, K.A. Nelson, J. Chem. Phys. 87, 6240 (1987)
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Hubschmid, W. Molecular relaxations in mixtures of O2 with CO2 observed on laser-induced gratings. Appl. Phys. B 94, 345–353 (2009). https://doi.org/10.1007/s00340-008-3273-2
Received:
Revised:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s00340-008-3273-2