TY - JOUR
T1 - Femtosecond isomerization dynamics in the ethylene cation measured in an EUV-pump NIR-probe configuration
AU - Van Tilborg, J.
AU - Allison, T. K.
AU - Wright, T. W.
AU - Hertlein, M. P.
AU - Falcone, R. W.
AU - Liu, Y.
AU - Merdji, H.
AU - Belkacem, A.
PY - 2009/4/24
Y1 - 2009/4/24
N2 - Dynamics in the excited ethylene cation C2H+ 4 lead to isomerization to the ethylidene configuration (HC-CH 3)+, which is predicted to be a transient configuration for electronic relaxation. With an intense femtosecond extreme ultraviolet pump pulse to populate the excited state, and a near infrared probe pulse to produce the fragments CH+ and CH+3 (which provides a direct signature of ethylidene), we measure optimum fragment yields at a probe delay of 80 fs. Also, an H2-stretch transient configuration, yielding H+2 upon probing, is found to succeed the ethylidene configuration. We find that a simple single- or double-decay model does not match the data, and we present a modified model (introduction of an isomerization delay of 50 25 fs) that does provide agreement.
AB - Dynamics in the excited ethylene cation C2H+ 4 lead to isomerization to the ethylidene configuration (HC-CH 3)+, which is predicted to be a transient configuration for electronic relaxation. With an intense femtosecond extreme ultraviolet pump pulse to populate the excited state, and a near infrared probe pulse to produce the fragments CH+ and CH+3 (which provides a direct signature of ethylidene), we measure optimum fragment yields at a probe delay of 80 fs. Also, an H2-stretch transient configuration, yielding H+2 upon probing, is found to succeed the ethylidene configuration. We find that a simple single- or double-decay model does not match the data, and we present a modified model (introduction of an isomerization delay of 50 25 fs) that does provide agreement.
U2 - 10.1088/0953-4075/42/8/081002
DO - 10.1088/0953-4075/42/8/081002
M3 - Article
AN - SCOPUS:64949126441
SN - 0953-4075
VL - 42
JO - Journal of Physics B: Atomic, Molecular and Optical Physics
JF - Journal of Physics B: Atomic, Molecular and Optical Physics
IS - 8
M1 - 081002
ER -