Title
| Vibrational Excitation of Ammonia Molecules by FEL-SUT |
Author(s)
| Ogi, Yoshihiro ; Tsukiyama, Koichi |
Affiliation
| (TUS-Kagurazaka, Shinjuku, Tokyo) |
Publication
| 2004 |
In:
| 26th International Free Electron Laser Conference and 11th FEL User Workshop 2004, Trieste, Italy, 29 Aug - 3 Sep 2004, pp.e-proc. THPOS26 |
Subject category
| Accelerators and Storage Rings |
Abstract
| Free Electron Laser at Tokyo University of Science (FEL-SUT) was employed for exciting single vibrational modes of ammonia molecules. FEL is tuned to 10.5 μm, corresponding to the X<sup>1</sup>A<sub>1</sub>' (ν<sub>2</sub> = 1) ← (ν<sub>2</sub> = 0) transition of NH<sub>3</sub>. The population of the vibrationally excited states is probed by the (2 + 1) resonance enhanced multiphoton ionization (REMPI) technique via the B <sup>1</sup>E" Rydberg state. Maximum excitation efficiency of ν<sub>2</sub> = 1 ← ν<sub>2</sub> = 0 transition was about 50 %, which was estimated by taking account of Franck-Condon factors and the rotational line strengths. Rotational analyses of the spectra revealed that vibrational ladder climbing up to ν<sub>2</sub> = 2 in NH<sub>3</sub> was realized for the first time. Experimental results on ν<sub>4</sub> vibrational excitation of NH<sub>3</sub> and ND<sub>3</sub> will be also reported. |