FLUORESCENCE LIFTIME MEASUREMENTS OF THE $A_{2}$STATE OF FORMALDEHYDE
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Date
1974
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Ohio State University
Abstract
The lifetime of the $^{1}A_{2}$ state of $H_{2}$CO was re-measured using a pulsed r-f discharge. The emission was dispersed on a monochromator, detected with a 56 AVP photomultiplier, and time sampled with a PAR Model 160 boxcar integrator. The discharge had a cut-off of 15 ns detected on a Hewlett-Packard Model 1710 A oscilloscope. The results of our experiment were in disagreement with recent formaldehyde high pressure$^{1,2}$ laser measurements and they are in closest agreement with previous absorption $measurements.^{3}$ Data were in the pressure range from 7 to 101 m Torr and were extrapolated to zero pressure. Our results for the wavelength regions near 5097, 4821, 4673, 4434, 4220, 4121, 3847, 3763, and 3679 {\AA} are $(3.76 \pm 0.25) \times 10^{-6}$, $(3.27 \pm 0.58) \times 10^{-6}$, $(3.02 \pm 0.07) \times 10^{-6}$, $(2.65 \pm 0.16) \times 10^{-6}$, $(2.63 \pm 0.26) \times 10^{-6}$, $(3.12 \pm 0.22) \times 10^{-6}$, $(3.34 \pm 0.13) \times 10^{-6}$, $(2.64 \pm 0.16) \times 10^{-6}$, $(3.46 \pm 0.26) \times 10^{-6}$, respectively.
Description
This research was supported by a ONR grant N00014-69-A-0141-0004. $^{1}$ T Aoki, T, Morikawa, and K, Sakurai, J. Chem. Phys. 59, 1543 (1973). $^{2}$K. Sakurai, G. Capelle, and H. P. Broida, J. Chem. Phys. 54, 1412 (1971). $^{3}$A. D. Cohen and C. Reid, J. Chem. Phys. 24, 85 (1956).
Author Institution: Department of physics, University of Missouri
Author Institution: Department of physics, University of Missouri