Direct High-Resolution Determination of the Singlet–Triplet Splitting in NH Using Stimulated Emission Pumping
✍ Scribed by Jan Leo Rinnenthal; Karl-Heinz Gericke
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 124 KB
- Volume
- 198
- Category
- Article
- ISSN
- 0022-2852
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✦ Synopsis
A completely resolved spectrum of the strongly forbidden NH (a 1 ⌬ 3 X 3 ⌺ Ϫ ) transition is observed. The NH radicals in the excited a 1 ⌬ state are exclusively generated in a Nd:YAG laser photolysis of hydrazoic acid at a wavelength of 266 nm. The NH (a 1 ⌬ 3 X 3 ⌺ Ϫ ) intercombination transition around 794 nm is used to produce NH (X 3 ⌺ Ϫ ) applying the stimulated emission pumping technique. The ground state radicals are detected by laser-induced fluorescence (LIF). The energy splitting between the NH (X 3 ⌺ Ϫ , v ϭ 0, J ϭ 1, N ϭ 0) state and the NH (a 1 ⌬, v ϭ 0, J ϭ 2) state is determined with an accuracy of 0.1 cm Ϫ1 to ⌬E ϭ 12 687.8 65 cm Ϫ1 . In addition, the radiative lifetime of the NH (a 1 ⌬ 3 X 3 ⌺ Ϫ ) transition was estimated by a determination of the saturation intensity to be Ϸ 12.5 s.