✍ Scribed by Gen-Hou Leu; Chun-Wei Hwang; I-Chia Chen
No coin nor oath required. For personal study only.
We detected fluorescence of OH (A 22+-X 2II) from nitric acid pbotolyzed at 193 nm. Transitions for spin-orbit states are resolved; the population ratio of these states is II3/2/FI]/2 ~ 1.1 ± 0.1. About 3% of available energy is distributed to rotation of the OH fragment; no vibrationally excited OH was observed. The translational energies of OH and NO 2 are estimated from the Doppler widths to be 2332 and 861 cm-~, respectively. These results indicate about 87.8% of the excess energy to be directed to internal energy of NO 2. The experimental data indicate that NO2 may be produced in an electronically excited state.
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Alignment effects in the highly rotating NO X %I vn = 1 fragment generated from photodissociation of CHaONO mr\* at 355 nm have been probed by two-photon laser-induced fluorescence spectra. From polarization experiments the rotational angular momentum of NO fragments was shown to be aligned preferen