Journal
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
Volume 42, Issue 8, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0953-4075/42/8/081002
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Funding
- DOE Office of Basic Energy Sciences, Chemical Sciences Division [DE-AC02-05CH11231, DE-FG52-06NA26212]
- UC Berkeley's France-Berkeley fund
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Dynamics in the excited ethylene cation C2H4+ lead to isomerization to the ethylidene configuration (HC-CH3)(+), 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 CH3+ (which provides a direct signature of ethylidene), we measure optimum fragment yields at a probe delay of 80 fs. Also, an H-2-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.
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