Measurement of weak ir absorption with a tunable laser: the hydrogen S(2)(1) line strength.
A tunable laser light source has been used to obtain the intensity of the S(2)(1) hydrogen quadrupole line at ~8604.2 cm(-1). The result (0.0140 +/- 0.0007 cm(-1)/km-amagat) is in excellent agreement with a previous determination as well as with ab initio calculations.
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