TY - JOUR

T1 - Polarization- and time-resolved DFWM spectroscopy of the A (2)Sigma(+) - X (2)Pi (0,0) band transitions of nascent OH radicals generated by 266nm laser photolysis of H2O2

AU - Maksyutenko, P.

AU - Radi, P. P.

AU - Kozlov, D. N.

AU - Kouzov, A. P.

PY - 2013

Y1 - 2013

N2 - The potential of a non-linear spectroscopic technique - degenerate four-wave mixing (DFWM) spectroscopy - for photo-dissociation studies is investigated. By applying a carefully considered control of the input beam polarizations, the technique is used to measure the line shapes of specific rovibrational transitions in the A(2)sigma(+)-X-2 (0,0) band of nascent OH radicals upon pulsed photo-dissociation of H2O2. The photofragmentation is performed by linearly polarized radiation at 266nm, and DFWM spectra are observed at various time delays. In contrast to linear spectroscopic methods, isotropic and anisotropic components of the non-linear susceptibility tensor are separately accessible by using appropriate polarization geometries. In particular, four-wave mixing signals can be generated that are exclusively due to the occurrence of the transient anisotropy of the recoil velocity and angular momentum vector distributions of the fragments emerging from the dissociation reaction. The observed line shapes in isot

AB - The potential of a non-linear spectroscopic technique - degenerate four-wave mixing (DFWM) spectroscopy - for photo-dissociation studies is investigated. By applying a carefully considered control of the input beam polarizations, the technique is used to measure the line shapes of specific rovibrational transitions in the A(2)sigma(+)-X-2 (0,0) band of nascent OH radicals upon pulsed photo-dissociation of H2O2. The photofragmentation is performed by linearly polarized radiation at 266nm, and DFWM spectra are observed at various time delays. In contrast to linear spectroscopic methods, isotropic and anisotropic components of the non-linear susceptibility tensor are separately accessible by using appropriate polarization geometries. In particular, four-wave mixing signals can be generated that are exclusively due to the occurrence of the transient anisotropy of the recoil velocity and angular momentum vector distributions of the fragments emerging from the dissociation reaction. The observed line shapes in isot

U2 - 10.1002/jrs.4299

DO - 10.1002/jrs.4299

M3 - Article

VL - 44

JO - Journal of Raman Spectroscopy

JF - Journal of Raman Spectroscopy

SN - 0377-0486

IS - 10

ER -