Anionic photofragmentation of CO: a selective probe of core-level resonances.
Anion-yield spectroscopy using x rays is shown to be a selective probe of molecular core-level processes, providing unique experimental verification of shape resonances. For CO, partial anion and cation yields are presented for photon energies near the C K edge. The O- yield exhibits features above threshold related only to doubly excited states, in contrast to cation yields which also exhibit pronounced structure due to the well-known sigma* shape resonance. Because the shape resonance is completely suppressed for O-, anion spectroscopy thus constitutes a highly selective probe, yielding information unobtainable with absorption or electron spectroscopy.
Stolte
W C
WC
Department of Chemistry, University of Nevada, Las Vegas, Nevada 89154-4003, USA.
Hansen
D L
DL
Piancastelli
M N
MN
Dominguez Lopez
I
I
Rizvi
A
A
Hemmers
O
O
Wang
H
H
Schlachter
A S
AS
Lubell
M S
MS
Lindle
D W
DW