Dynamic stabilization in 1sigma(u)-->1pi(g) excited nitrogen clusters.
High-resolution 1s near-edge spectra of molecular nitrogen and variable size nitrogen clusters obtained using monochromatic synchrotron radiation from the high brilliance BESSY-II storage ring facility are reported. The vibrationally resolved 1sigma(u)-->1pi(g) core-to-valence excitation band of clusters shows a distinct redshift of 6+/-1 meV relative to the isolated molecule, but the vibrational structure and linewidths are essentially unchanged. This shift is assigned to dynamic stabilization of 1sigma(u)-->1pi(g) excited molecules in clusters, arising from the dynamic dipole moment generated by core-hole localization in the low-symmetry cluster field. This leads to changes in intermolecular interactions compared to the ground-state cluster. Such spectral shifts are expected to occur generally in molecular clusters and in the corresponding condensed phase.
Flesch
R
R
Fachbereich Physik, Universität, Osnabrück, Barbarastrasse 7, 49069 Osnabrück, Germany.
Pavlychev
A A
AA
Neville
J J
JJ
Blumberg
J
J
Kuhlmann
M
M
Tappe
W
W
Senf
F
F
Schwarzkopf
O
O
Hitchcock
A P
AP
Rühl
E
E