Two-photon spectroscopy of autoionizing states of ammonia.
Two-photon ionization spectra of jet-cooled NH{sub 3} have been obtained in the region between the adiabatic ionization potential and the NH{sub 3}{sup +} X-tilde 2A{sub 2}{sup {double_prime}}(0200) ionization threshold. Fairly intense np and nf Rydberg series are observed converging to selected rotational levels of the X-tilde 2A{sub 2}{sup {double_prime}}(0100) and (0200) states. Rydberg series converging to higher vibrational thresholds and requiring vibrational autoionization by {Delta}v{sub i}{<=}-2 are also observed. Photoelectron spectroscopy reveals that many of the molecules in the latter series do not autoionize, but instead are ionized by the absorption of an additional photon. The new two-photon spectra are compared with previously reported double resonance spectra in the same energy region, providing insight into questions of the spectroscopic assignments.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 949256
- Report Number(s):
- ANL/CHM/JA-39234
- Journal Information:
- J. Chem. Phys., Journal Name: J. Chem. Phys. Journal Issue: 6 ; Aug. 8, 2001 Vol. 115; ISSN JCPSA6; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- ENGLISH
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