10.6078/D10X1Z
Kobayashi, Yuki
0000-0002-4391-1328
University of California, Berkeley
Chang, Kristina
University of California, Berkeley
Zeng, Tao
Carleton University
Neumark, Daniel
University of California, Berkeley
Leone, Stephen
University of California, Berkeley
Direct mapping of curve-crossing dynamics in IBr by attosecond transient
absorption spectroscopy
Dryad
dataset
2019
2019-06-07T22:00:39Z
2019-06-07T22:00:39Z
en
1599856 bytes
1
Creative Commons Attribution 4.0 International (CC BY 4.0)
Herein is the experimental data set for the publication titled
"Direct mapping of curve-crossing dynamics in IBr by attosecond
transient absorption spectroscopy." The abstract of the paper is as
follows: The electronic character of photoexcited molecules can abruptly
change at avoided crossings and conical intersections. Here, we report
direct mapping of the coupled interplay between electrons and nuclei in a
prototype molecule, iodine monobromide (IBr), using attosecond transient
absorption spectroscopy. A few-femtosecond visible pulse resonantly
excites the B(3Π0+), Y(0+), and Z(0+) states of IBr, and the
photodissociation dynamics are tracked by an attosecond
extreme-ultraviolet pulse that simultaneously probes the I-4d and Br-3d
core-level absorption edges. Direct comparison with quantum mechanical
simulations unambiguously identifies the core-level absorption features
associated with adiabatic and diabatic channels at the B/Y avoided
crossing and concurrent two-photon dissociation processes that involve the
Y/Z avoided crossing. The results show clear evidence for rapid switching
of valence-electronic character at the avoided crossing.
File #1 "pump_probe_spec.txt" This 2D file contains the
experimental results of the delay-dependent transient absorption
measurements. The scales for the axes (delay time, photon energy) are
provided in the other files. The values ΔOD are unitless. File #2
"delay.txt" This 1D file provides the delay time information.
The units are femtosecond (fs). File #3 "photon_energy.txt" This
1D file provides the calibration of the XUV spectrometer. The units are
electronvolt (eV).