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# LASER-EXCITED VIBRATIONAL FLUORESCENCE AND ENERGY TRANSFER IN METHANE

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/15098

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 Title: LASER-EXCITED VIBRATIONAL FLUORESCENCE AND ENERGY TRANSFER IN METHANE Creators: Yardley, James T.; Moore, C. Bradley Issue Date: 1966 Abstract: A He-Ne gas laser $(2950 cm^{-1})$ has been used to excite the asymmetric stretch $(\nu_{a})$ of methane. Vibrational fluorescence has been observed from the $\nu_{4}$ mode around $1300 cm^{-1}$. Detailed study of the phase lag between excitation and fluorescence has allowed us to determine not only the relaxation time of the $\nu_{4}$ mode $(pr=1.7 \mu \sec. atm)$ but also the time for relaxation of vibrational energy from $\nu_{4}$ to $\nu_{4} (pr = 6\pm 2 nsec. atm)$. We believe this to be the first direct measurement of a vibration-vibration relaxation time in a polyatomic molecule. This work supported from grants from the National Science Foundation and from ARPA. URI: http://hdl.handle.net/1811/15098 Other Identifiers: 1966-R-5