Breakdown of the two-step model in K-shell photoemission and subsequent decay probed by the molecular-frame photoelectron angular distributions of CO2.
We report results of measurements and of Hartree-Fock level calculations of molecular-frame photoelectron angular distributions (MFPADs) for C 1s photoemission from CO2. The agreement between the measured and calculated MFPADs is on average reasonable. The measured MFPADs display a weak but definite asymmetry with respect to the O+ and CO+ fragment ions at certain energies, providing evidence for an overlap of gerade and ungerade final ionic states giving rise to a partial breakdown of the two-step model of core-level photoionization and its subsequent Auger decay.
Liu
X-J
XJ
Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan.
Fukuzawa
H
H
Teranishi
T
T
De Fanis
A
A
Takahashi
M
M
Yoshida
H
H
Cassimi
A
A
Czasch
A
A
Schmidt
L
L
Dörner
R
R
Wang
K
K
Zimmermann
B
B
McKoy
V
V
Koyano
I
I
Saito
N
N
Ueda
K
K