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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Experimental Line Parameters of the b1Σg r X3Σg - Band of Oxygen Isotopologues at 760 nm Using Frequency-Stabilized Cavity Ring-Down Spectroscopy
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Experimental Line Parameters of the b1Σg r X3Σg - Band of Oxygen Isotopologues at 760 nm Using Frequency-Stabilized Cavity Ring-Down Spectroscopy

机译：b1ΣgrX3Σg-760nm频率稳定腔衰荡光谱的氧同位素分子的实验谱线参数

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摘要

Positions, intensities, self-broadened widths, and collisional narrowing coefficients of the oxygen isotopologues 16O18O, 16O17O, 17O18O, and 18O18O have been measured for the b1Σg + r X3Σg - (0,0) band using frequencystabilized cavity ring-down spectroscopy. Line positions of 156 P-branch transitions were referenced against the hyperfine components of the 39K D1 (4s 2S1/2 f 4p 2P1/2) and D2 (4s 2S1/2 f 4p 2P3/2) transitions, yielding precisions of 0.00005 cm-1 and absolute accuracies of 0.00030 cm-1 or better. New excited b1Σg + state molecular constants are reported for all four isotopologues. The measured line intensities of the 16O18O isotopologue are within 2% of the values currently assumed in molecular databases. However, the line intensities of the 16O17O isotopologue show a systematic, J-dependent offset between our results and the databases. Self-broadening half-widths for the various isotopologues are internally consistent to within 2%. This is the first comprehensive study of the line intensities and shapes for the 17O18O or 18O2 isotopologues of the b1Σg + r X3Σg - (0,0) band of O2. The 16O2, 16O18O, and 16O17O line parameters for the oxygen A-band have been extensively revised in the HITRAN 2008 database using results from the present study.
机译：氧同位素16O18O，16O17O，17O18O和18O18O的位置，强度，自扩展宽度和碰撞变窄系数已使用频率稳定腔衰荡光谱法测量了b1Σg+ rX3Σg-（0,0）带。相对于39K D1（4s 2S1 / 2 f 4p 2P1 / 2）和D2（4s 2S1 / 2 f 4p 2P3 / 2）过渡的超精细分量，参考了156个P分支过渡的行位置，产生的精度为0.00005 cm- 1，且绝对精度为0.00030 cm-1或更高。据报道，所有四个同位素都激发了新的b1Σg+态分子常数。 16O18O同位素同位素的测量线强度在分子数据库中当前假定值的2％之内。但是，16O17O同位素同位素的线强度表明我们的结果与数据库之间存在系统的，依赖于J的偏移。各种同位素的自增宽半宽度内部一致性在2％以内。这是对b1Σg+ rX3Σg-（0,0）带的17O18O或18O2同位素的线强度和线形的首次全面研究。使用本研究的结果，在HITRAN 2008数据库中对氧气A波段的16O2、16O18O和16O17O线参数进行了广泛修订。

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