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Title: All-XUV pump-probe transient absorption spectroscopy of the structural molecular dynamics of di-iodomethane
Authors: Rebholz, M.
Ding, T.
Despré, V.
Aufleger, L.
Hartmann, M.
Meyer, K.
Stooß, V.
Magunia, A.
Wachs, D.
Birk, P.
Mi, Y.
Borisova, G. D.
Castanheira, C. D. C.
Rupprecht, P.
Schmid, G.
Schnorr, K.
Schröter, C. D.
Moshammer, R.
Loh, Zhi-Heng
Attar, A. R.
Leone, S. R.
Gaumnitz, T.
Wörner, H. J.
Roling, S.
Butz, M.
Zacharias, H.
Düsterer, S.
Treusch, R.
Brenner, G.
Vester, J.
Kuleff, A. I.
Ott, C.
Pfeifer, T.
Keywords: Science::Chemistry
Issue Date: 2021
Source: Rebholz, M., Ding, T., Despré, V., Aufleger, L., Hartmann, M., Meyer, K., Stooß, V., Magunia, A., Wachs, D., Birk, P., Mi, Y., Borisova, G. D., Castanheira, C. D. C., Rupprecht, P., Schmid, G., Schnorr, K., Schröter, C. D., Moshammer, R., Loh, Z., ...Pfeifer, T. (2021). All-XUV pump-probe transient absorption spectroscopy of the structural molecular dynamics of di-iodomethane. Physical Review X, 11(3), 031001-.
Project: RG105/17
Journal: Physical Review X
Abstract: In this work, we use an extreme-ultraviolet (XUV) free-electron laser (FEL) to resonantly excite the I: 4d5/2-σ∗ transition of a gas-phase di-iodomethane (CH2I2) target. This site-specific excitation generates a 4d core hole located at an iodine site, which leaves the molecule in a well-defined excited state. We subsequently measure the time-dependent absorption change of the molecule with the FEL probe spectrum centered on the same I: 4d resonance. Using ab initio calculations of absorption spectra of a transient isomerization pathway observed in earlier studies, our time-resolved measurements allow us to assign the timescales of the previously reported direct and indirect dissociation pathways. The presented method is thus sensitive to excited-state molecular geometries in a time-resolved manner, following a core-resonant site-specific trigger.
ISSN: 2160-3308
DOI: 10.1103/PhysRevX.11.031001
Rights: © 2021 The Author(s). Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Open access publication funded by the Max Planck Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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