High-order multiphoton ionization photoelectron spectroscopy of nitric oxide
Resonance-enhanced and nonresonant five- and six-photon ionization of NO was studied using angle resolved photoelectron spectroscopy. The (3+3)= resonance-enhanced multiphoton ionization photoelectron spectrum (REMPI-PES) of NO via the A /sup 2/ ..sigma../sup +/ (v = 0) level yielded a distribution of electron energies corresponding to all accessible vibrational levels (v/sup +/ = 0--6) of the nascent ion. The observed energy distributions suggest near resonant enhancement due to vibrational levels of the D /sup 2/ ..sigma../sup +/ and C /sup 2/ Pi states at the fourth photon level. Angular distributions of photoelectrons corresponding to v/sup +/ = 0 and v/sup +/ = 3 (rotationally unresolved) were significantly different, perhaps reflecting these different pathways. The (3+2) REMPI via the A /sup 2/ ..sigma../sup +/ (v = 1) level produced only one low-energy electron peak corresponding to v/sup +/ = 1. Nonresonant MPI at 532 nm yielded a distribution of photoelectron energies corresponding to both four- and five-photon ionization. Prominent peaks in the five-photon ionization photoelectron spectrum show that near resonant enhancement occurs via the A /sup 2/ ..sigma../sup +/ (v = 5), the C /sup 2/ Pi(v = 2) and the D /sup 2/ ..sigma../sup +/ (v = 1) states at the three-photon level. This study amply demonstrates the utility of angle resolved MPI-PES in understanding high-order multiphoton ionization processes.
- Research Organization:
- Chemical Physics Section, Health and Safety Research Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6125
- OSTI ID:
- 6545901
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 90:3; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400102 -- Chemical & Spectral Procedures
500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION MONITORING
ANGULAR DISTRIBUTION
ATMOSPHERIC CHEMISTRY
CHALCOGENIDES
CHEMISTRY
DISTRIBUTION
ELECTRON SPECTROSCOPY
ENERGY LEVELS
EXCITED STATES
IONIZATION
MULTI-PHOTON PROCESSES
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
OXIDES
OXYGEN COMPOUNDS
PHOTOELECTRON SPECTROSCOPY
PHOTOIONIZATION
RESONANCE
RYDBERG STATES
SPECTROSCOPY