Spectral dependence of photoemission in multiphoton ionization of NO2 by femtosecond pulses in the 375–430 nm range

Poullain, S. Marggi; Cireasa, R.; Cornaggia, C.; Simon, M.; Marin, T.; Guillemin, R.; Houver, J. C.; Lucchese, R. R.; Dowek, D.

doi:10.1039/c7cp02057k

Spectral dependence of photoemission in multiphoton ionization of NO₂ by femtosecond pulses in the 375–430 nm range

Journal Article · Thu Jul 27 00:00:00 EDT 2017 · Physical Chemistry Chemical Physics. PCCP

DOI:https://doi.org/10.1039/c7cp02057k· OSTI ID:1461114

^[1]; Cireasa, R. ^[2]; Cornaggia, C. ^[3]; Simon, M. ^[4]; Marin, T. ^[4]; Guillemin, R. ^[4]; Houver, J. C. ^[2]; Lucchese, R. R. ^[5]; Dowek, D. ^[2]

Univ. of Paris-Sud, Orsay (France). Inst. of Molecular Sciences of Orsay (ISMO); Complutense Univ. of Madrid (Spain). Dept. of Physical Chemistry. Faculty of Chemical Sciences
Univ. of Paris-Sud, Orsay (France). Inst. of Molecular Sciences of Orsay (ISMO)
Alternative Energies and Atomic Energy Commission (CEA), Saclay (France). Interactions, Dynamics and Lasers Lab. (LIDYL)
National Centre for Scientific Research (CNRS) and Pierre and Marie Curie Univ, Paris (France). Lab. of Physical Chemistry - Matter and Radiation (LCPMR)
Texas A & M Univ., College Station, TX (United States). Dept. of Chemistry

In this paper, we investigate the multiphoton ionization of NO₂ using tunable (430–375 nm) femtosecond pulses and photoelectron–photoion coincidence momentum spectroscopy. In order to understand the complex electronic and nuclear photodynamics at play following absorption of three to five photons, we also report extended photoionization calculations using correlated targets and coupled channels. Exploring the multiphoton dissociative ionization (MPDI) and multiphoton ionization (MPI) processes over such a broad energy range enables us to lend further support to our work carried out around 400 nm of a femtosecond laser [S. Marggi Poullain et al., J. Phys. B: At., Mol. Opt. Phys., 2014, 47, 124024]. Two excitation energy regions are identified and discussed in terms of the proposed reaction pathways, highlighting the significant role of Rydberg states, such as the [R*(6a₁)^-1, 3pσ] Rydberg state, in the NO₂ multiphoton excitation and photoionization. These new results support our previous assumption that different bent and linear geometries of the NO₂⁺(X¹Σ_g) ionic state contribute to the MPDI and MPI, consistent with the reported calculations which reveal an important vibronic coupling characterizing the photoemission. Finally, remarkably, the strong anisotropy of the recoil frame photoelectron angular distribution (RFPAD) previously observed at 400 nm appears as a fingerprint across the whole explored photon energy range.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Robert A. Welch Foundation (United States); National Research Agency (ANR) (France)

Grant/Contract Number:: SC0012198

OSTI ID:: 1461114

Journal Information:: Physical Chemistry Chemical Physics. PCCP, Journal Name: Physical Chemistry Chemical Physics. PCCP Journal Issue: 33 Vol. 19; ISSN 1463-9076

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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Cited By (1)

High resolution vibronic state-specific dissociation of NO ₂ ⁺ in the 10.0–15.5 eV energy range by synchrotron double imaging photoelectron photoion coincidence Tang, Xiaofeng; Garcia, Gustavo A.; Nahon, Laurent Physical Chemistry Chemical Physics, Vol. 22, Issue 4 https://doi.org/10.1039/c9cp05847h	journal	January 2020

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