Relative quantum yield of O(¹D₂) following ozone photolysis between 275 and 325 nm

Abstract

Relative values of the quantum yield of O(XD2) from the photolysis of ozone in the wavelength region 275-325 nm have been measured by observing infrared fluorescence following the reaction O(XD2) -3-CO2--•O(3pj)-3-C02((mnp), indicating multiply vibrationally excited CO 2 with m quanta in the symmetric mode v x, n in the (doubly degenerate) bend v 2, and p in the asymmetric stretch %)), using the frequency-doubled output of a narrow-band dye laser as the photolysis source. The location and shape of the falloff in O(XD2) yield near 310 nm confirms the results of previous studies made with other means of quantifying O(XD2). A "tail" in the quantum yield at longer wavelengths, not consistently observed in other experiments, is clearly evident here. The quantum yield also appears to decrease slowly at wavelengths shorter than about 290 nm. INTRODUCTION

Relative quantum yields for O1D production in the photolysis of ozone between 301 and 336 nm: evidence for the participation of a spin-forbidden channel

“…late their results but their reported yields are in very close agreement with the yields of Trolier and Weisenfeld [16]. Recent measurements of Ball and coworkers [17][18][19] show that the yield of O2(~A) is significant out to 325 nm.…”

“…Early experiments on the yield of O ID were reviewed by Steinfeld et al [1]. Those workers recommended a 'tail' in @O'D based on the laser photolysis experiments of Brock and Watson [15] and Trolier and Weisenfield [16]. However, both the NASA and IUPAC panels have continued to regard this tail as an artifact.…”

Sensitivity studies of the recent new data on O(<sup>1</sup><i>D</i>) quantum yields in O<sub>3</sub> Hartley band photolysis in the stratosphere

“…Talukdar et al (1998) reported that the O( 1 D) quantum yield between 289 and 305 nm was 0.89±0.02, which is in good agreement with results presented by Taniguchi et al (2000) and Takahashi et al (2002). The yield values reported by Trolier and Wiesenfeld (1988) and JPL-2000 recommendations in this wavelength region are larger than values reported by Talukdar et al (1998) , Taniguchi et al (2000), and Takahashi et al (2002). At shorter wavelengths, JPL-2000 panel has recommended a constant value of 0.95 for the O( 1 D) quantum yield in the Hartley band photolysis of O 3 between obtained by Taniguchi et al (2000) and Takahashi et al (2002).…”

“…In Fig. 2, the yield values presented by Taniguchi et al (2000) and Takahashi et al (2002) are compared with both values previously reported by other different groups (Trolier and Wiesenfeld, 1988;Cooper et al, 1993;Talukdar et al, 1997Talukdar et al, , 1998 and JPL-2000 recommendations . Talukdar et al (1998) reported that the O( 1 D) quantum yield between 289 and 305 nm was 0.89±0.02, which is in good agreement with results presented by Taniguchi et al (2000) and Takahashi et al (2002).…”

“…(2000) and Takahashi et al (2002). For comparison, the yield values reported by other groups are also shown (Trolier and Wiesenfeld, 1988;Cooper et al, 1993;Talukdar et al, 1997Talukdar et al, , 1998. Solid line indicates the yield values recommended by JPL-2000 evaluations for atmospheric modeling by NASA panel , which are constant (0.95) between 240 and 300 nm.…”