skip to main content

DOE PAGESDOE PAGES

Title: Spectral dependence of photoemission in multiphoton ionization of NO 2 by femtosecond pulses in the 375–430 nm range

In this paper, we investigate the multiphoton ionization of NO 2 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*(6a 1) -1, 3pσ] Rydberg state, in the NO 2 multiphoton excitation and photoionization. These new results support our previous assumption that different bent and linear geometries of the NO 2 +(X 1Σ 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 atmore » 400 nm appears as a fingerprint across the whole explored photon energy range.« less
Authors:
ORCiD logo [1] ;  [2] ;  [3] ;  [4] ;  [4] ;  [4] ;  [2] ;  [5] ;  [2]
  1. 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
  2. Univ. of Paris-Sud, Orsay (France). Inst. of Molecular Sciences of Orsay (ISMO)
  3. Alternative Energies and Atomic Energy Commission (CEA), Saclay (France). Interactions, Dynamics and Lasers Lab. (LIDYL)
  4. National Centre for Scientific Research (CNRS) and Pierre and Marie Curie Univ, Paris (France). Lab. of Physical Chemistry - Matter and Radiation (LCPMR)
  5. Texas A & M Univ., College Station, TX (United States). Dept. of Chemistry
Publication Date:
Grant/Contract Number:
SC0012198; A-1020; ANR-10-LABX-0039-PALM
Type:
Accepted Manuscript
Journal Name:
Physical Chemistry Chemical Physics. PCCP (Print)
Additional Journal Information:
Journal Name: Physical Chemistry Chemical Physics. PCCP (Print); Journal Volume: 19; Journal Issue: 33; Journal ID: ISSN 1463-9076
Publisher:
Royal Society of Chemistry
Research Org:
Texas A & M Univ., College Station, TX (United States); Univ. of Paris-Sud, Orsay (France); National Centre for Scientific Research (CNRS) and Pierre and Marie Curie Univ, Paris (France)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Robert A. Welch Foundation (United States); National Research Agency (ANR) (France)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
OSTI Identifier:
1461114