# INFRARED DIODE LASER SPECTROSCOPY OF THE ALLYL RADICAL: THE $\nu_{11}$ BAND

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/12869

Files Size Format View
1992-TE-01.jpg 64.56Kb JPEG image

 Title: INFRARED DIODE LASER SPECTROSCOPY OF THE ALLYL RADICAL: THE $\nu_{11}$ BAND Creators: Hirota, Eizi; Yamada, Chikashi; Okunishi, Misaki Issue Date: 1992 Publisher: Ohio State University Abstract: We generated allyl radicals mainly by the photolysis of 1,5-hexadiene at 193 nm and detected them by observing the $\nu_{IF}$ i.e. $CH_ 2$ symmetric wagging band by infrared diode laser kinetic spectroscopy. The observed spectrum showed clearly the effect of nuclear spin statistical weights, establishing the presence of a $C_{2}^{(b)}$ axis in the molecule. The spin-rotation splitting was not resolved; only some high $K_{a}$ lines were found broader than others, placing an upper limit for the $t_{aa}$ constant at about 200 MHz or kss. The rotational constants derived from the observed spectrum are $A^{\prime}=1.787520$ (74), $B^{\prime}=0.345363$(26), $C^{\prime}=0.290347$ (27), $A^{\prime}=1.801890$ (92), $B^{\prime}=0.346320$ (26), and $C_^{\prime}=0.290219$ (27) in $cm^{-1},$ which indicate that the molecule is essentially planer, the intertial defect is 0.0539 66 and -0.1817 (66) amu{\AA}$^{2}$ for the lower and the upper state, respectively. The C-C bond length and the CCC bond angle were calculated from the ground-state rotational constants to be 1.3869 (33) {\AA} and 123.96 $(48)^{\circ},$ respectively, where structural parameters involving hydrogens were fixed to those of ab inito values. Description: Author Institution: The Graduate University for Advanced Studies; The Institute for Molecular Science, The Graduate University for Advanced Studies URI: http://hdl.handle.net/1811/12869 Other Identifiers: 1992-TE-01