dc.creator Lee, Y. S. en_US dc.creator Mills, James W. en_US dc.date.accessioned 2006-06-15T17:13:53Z dc.date.available 2006-06-15T17:13:53Z dc.date.issued 1974 en_US dc.identifier 1974-RH-8 en_US dc.identifier.uri http://hdl.handle.net/1811/16394 dc.description $^{1}$R. N. Zare, Accounts of Chemical Research 4, 361 (1971). en_US dc.description Author Institution: Department of Chemistry, Drew University en_US dc.description.abstract Fluorescence from low pressure benzene vapor was observed to be plane polarized when excited with polarised 253.7 nm radiation. Fluorescence at 261.7 nm, observed under low resolution (1.1 am bandwidth), exhibits a degree of polarization ($I_\parallel - I_\bot)/(I_\parallel + I_\bot$) of approximately 1/7 upon extrapolation to zero benzene pressure. Collisiona1 reorientation reduces the degree of polarisation Co one half the zero pressure value at 0.3 Torr benzene pressure. Collisions causing vibrationa1 relaxation in the $^{1}B_{2u}$ state cause reorientation. Exploratory experiments indicate that an externally applied magnetic field causes a change in the angular distribution of the fluorescence intensity at 261.7 nm. The fluorescence was excited from a direction perpendicular to the magnetic field and detected along the field direction. As the field was scanned between 0 - 2000 Gauss, the fluorescence intensity followed a pattern suggesting that interference effects exist among magnetic sublevels of the excited vibronic $state.^{1}$ Since the entire pattern was not observable with our magnet, the number of components, their spacings and widths and the high-field intensity limit necessary for complete interpretation cannot he obtained from our exploratory work. Acknowledgement Is made to the donors of the Petroleum Research Fund, administered by the American Chemical Society, for partial support of this research. en_US dc.format.extent 257684 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title PLANE POLARIZATION AND MAGNETIC INTERFERENCE EFFECTS IN BENZENE VAPOR FLUORESCENCE en_US dc.type article en_US
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