Abstract
Photoelectron energy and angular distributions of NO following three different high‐order multiphoton ionization (MPI) schemes have been measured. The 3+3 resonantly enhanced multiphoton ionization (REMPI) via the A2Σ+ (v=0) level yielded a distribution of electron energies corresponding to all accessible vibrational levels (v+=0–6) of the nascent ion. Angular distributions of electrons corresponding to v+=0 and v+=3 were significantly different. The 3+2 REMPI via the A2Σ+ (v=1) level produced only one low‐energy electron peak (v+=1). Nonresonant MPI at 532 nm yielded a distribution of electron energies corresponding to both four‐ and five‐photon ionization. Prominent peaks in the five‐photon photoelectron spectrum (PES) suggest contributions from near‐resonant states at the three‐photon level.
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