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Figure 2
Illustration of the photoselection process. Before the arrival of the laser pump ([t\,\lt\,0]), the molecules are randomly oriented in solution. The laser pulse preferentially excites the molecules with the transition dipole moments parallel to the laser polarization axis. Thus, the excited-state population is created as an aligned ensemble (at t = 0 the distribution of the transition dipole moment in molecules being excited is a cosine-squared distribution with respect to the laser polarization axis) yielding anisotropic difference scattering patterns. After the excitation event ([t\,\gt\,0]), the rotation of both the excited and unexcited populations causes rotational dephasing of the alignment.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 25| Part 2| March 2018| Pages 306-315
https://doi.org/10.1107/S1600577517016964
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