Measurement of excited state population decay time in NH3 by optical adiabatic rapid passage
✍ Scribed by S.M. Hamadani; N.A. Kurnit; A. Javan
- Publisher
- Elsevier Science
- Year
- 1977
- Tongue
- English
- Weight
- 500 KB
- Volume
- 49
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
A strong Q-switched N20 laser capable of60 MHz frequency sweep is used to induce population inversiou by optical adiabatic rapid passage on the +[asQ(8,7)] transition of I4 NH3. The fa'st inversion and the subsequent return to equihbrium are detected by a cw weak counterpropagating N20 laser, and are used to measure the pressure dependence of ewited state population relaxation time T1 for the infrared transition of interest. This decay is found to be 3.6 times slower than the corresponding decay in the ground state, an effect which may be explained by the larger inversion energy separation in the excited state of NH3.
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