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Title: Disentangling conical intersection and coherent molecular dynamics in methyl bromide with attosecond transient absorption spectroscopy

Journal Article · · Nature Communications
 [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [1];  [1];  [4];  [1]; ORCiD logo [2]; ORCiD logo [5];  [1]
  1. Univ. of California, Berkeley, CA (United States)
  2. SLAC National Accelerator Lab., Menlo Park, CA (United States). Photon Ultrafast Laser Science and Engineering Inst. (PULSE)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States). Photon Ultrafast Laser Science and Engineering Inst. (PULSE); Max Planck Inst. for the Structure and Dynamics of Matter, Hamburg (Germany); Peking Univ., Beijing (China)
  4. Univ. of Hamburg (Germany)
  5. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Attosecond probing of core-level electronic transitions provides a sensitive tool for studying valence molecular dynamics with atomic, state, and charge specificity. In this report, we employ attosecond transient absorption spectroscopy to follow the valence dynamics of strong-field initiated processes in methyl bromide. By probing the 3d core-to-valence transition, we resolve the strong field excitation and ensuing fragmentation of the neutral σ* excited states of methyl bromide. The results provide a clear signature of the non-adiabatic passage of the excited state wavepacket through a conical intersection. We additionally observe competing, strong field initiated processes arising in both the ground state and ionized molecule corresponding to vibrational and spin-orbit motion, respectively. The demonstrated ability to resolve simultaneous dynamics with few-femtosecond resolution presents a clear path forward in the implementation of attosecond XUV spectroscopy as a general tool for probing competing and complex molecular phenomena with unmatched temporal resolution.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
National Science Foundation (NSF); Army Research Office (ARO); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division
Grant/Contract Number:
AC02-76SF00515; W911NF-14-1-0383; CHE-1361226; CHE-1660417; AC02-05CH11231
OSTI ID:
1546796
Alternate ID(s):
OSTI ID: 1559236
Journal Information:
Nature Communications, Vol. 10, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 45 works
Citation information provided by
Web of Science

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Cited By (6)

Ultrafast dissociative ionization and large-amplitude vibrational wave packet dynamics of strong-field-ionized di-iodomethane journal December 2019
Ultrafast dissociation dynamics of singly and doubly ionized N 2 O in strong laser fields journal January 2020
Revealing Ultrafast Population Transfer between Nearly Degenerate Electronic States journal January 2020
Revealing electronic state-switching at conical intersections in alkyl iodides by ultrafast XUV transient absorption spectroscopy journal August 2020
Efficient table-top dual-wavelength beamline for ultrafast transient absorption spectroscopy in the soft X-ray region text January 2019
Visualizing Conical Intersection Passages via Vibronic Coherence Maps Generated by Stimulated Ultrafast X--Ray Raman Signals text January 2020