Detailed calculation of hydroxyl (OH) radical two-photon absorption via broadband ultrafast excitation

abstract

• The theoretical framework for calculation of two-photon absorption cross sections for intermediate Hund's cases (a) and (b) diatomic species is described in detail and applied toward the hydroxyl (OH) radical. Analytical expressions are derived for the 20 rotational branches that are present in the two-photon A 2 +X2 electronic transition. Calculation of the corresponding line strengths is necessary to permit accurate relative-concentration measurements obtained from the fluorescence induced by a broadband femtosecond excitation pulse. We demonstrate, in particular, that consideration of the temperature-dependent initial-state populations of OH is necessary to obtain accurate relative concentrations from observed two-photon-excitation based laser-induced-fluorescence measurements. 2011 Optical Society of America.

authors

• Kulatilaka, Waruna

published proceedings

• JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS

author list (cited authors)

• Stauffer, H. U., Roy, S., Kulatilaka, W. D., & Gord, J. R.

citation count

• 10

complete list of authors

• Stauffer, Hans U||Roy, Sukesh||Kulatilaka, Waruna D||Gord, James R

publication date

• January 2012

publisher

• Optica Publishing Group  Publisher

published in

• Journal of the Optical Society of America. B, Optical physics  Journal

keywords

• 40 Engineering
• 4008 Electrical Engineering
• 51 Physical Sciences
• 5102 Atomic, Molecular And Optical Physics
• 5108 Quantum Physics

Digital Object Identifier (DOI)

• 10.1364/JOSAB.29.000040

start page

• 40

end page

• 52

volume

• 29

issue

• 1

URL

• http://dx.doi.org/10.1364/josab.29.000040