Probing doubly excited ionic states of N2+ via a triple excitation above the N 1s threshold in the N2 molecule

Feifel R.

Ueda K.

Fanis A.De

Okada Kazumasa

Tanimoto S.

Furuta T.

Shindo H.

Kitajima M.

Tanaka H.

Björneholm O.

Karlsson L.

Svensson S.

Sorensen S.L.

Physical review A

Angle-resolved resonant Auger-electron spectroscopy has been carried out on the nitrogen molecule at selected photon energies around 419 eV, where a 1s core electron and two valence electrons are promoted into the lowest unoccupied molecular orbital 1πg. Significant enhancement of a specific band, which cannot be disentangled in direct photoionization, is observed at a binding energy of 37.6 eV, with a value of the anisotropy parameter β much smaller than 2. We assign this new band to the transition to a doubly excited cationic state of N2, in which two of the excited valence electrons remain in the 1πg orbital, proposing a "double spectator" type decay mechanism. This observation shows how to preferentially probe multiply excited configurations of cations using multiple resonant excitation.

Chemistry [ 430 ]

eng

The American Physical Society

Copyright (c) 2003 The American Physical Society

[ISSN] 1050-2947

[DOI] http://dx.doi.org/10.1103/PhysRevA.67.032504 isVersionOf