Photoionization studies of the atmospherically important species N and OH at the Elettra synchrotron radiation source

In this paper angularly resolved photoelectron spectra (PES) and constant-ionic-state (CIS) spectra are presented for the atmospherically important species N and OH. The natural width Gamma, line shape parameters q and p(2) and discrete oscillator strengths f have been measured for the members of the N*[2s2p(3)(S-5). np] (P-4) <-- N(S-4) autoionizing resonances for n = 5-10. The n = 5 parameters calculated in this work are in good agreement with the values obtained previously whereas for the resonances with n = 6-10 the values of these parameters are reported for the first time. The asymmetry parameter (beta) for the first band of N atoms, the N+(P-3) <-- N(S-4) ionization, has also been measured in the photon energy range of the above autoionizing resonances. For OH, CIS spectra have been recorded for the first photoelectron band corresponding to the ionization OH+(X(3)Sigma(-), v(+) = 0) <-- OH(X(2)Pi. v = 0). In these spectra, rotationally partially resolved bands associated with OH*(a(1)Delta3d, v' = 0) <-- OH(X(2)Pi, v = 0) resonances have been observed. Suggestions for their assignment are made on the basis of their positions and band simulations which use rotational line strength calculations. (C) 2004 Elsevier B.V. All rights reserved.