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Fournier M, Lopez GV, Spiliotis AK, Casey TA, Rakitzis TP, Chandler DW. Alignment and dissociation of electronically excited molecular hydrogen with intense laser fields. Mol Phys 2021. [DOI: 10.1080/00268976.2020.1778200] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Martin Fournier
- Combustion Research Facility, Sandia National Laboratories, Livermore, CA, USA
| | - Gary V. Lopez
- Combustion Research Facility, Sandia National Laboratories, Livermore, CA, USA
| | - Alexandros K. Spiliotis
- Department of Physics, Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, University of Crete, Crete, Greece
| | - Tiernan A. Casey
- Combustion Research Facility, Sandia National Laboratories, Livermore, CA, USA
| | - T. Peter Rakitzis
- Department of Physics, Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, University of Crete, Crete, Greece
| | - David W. Chandler
- Combustion Research Facility, Sandia National Laboratories, Livermore, CA, USA
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Lopez GV, Fournier M, Jankunas J, Spiliotis AK, Rakitzis TP, Chandler DW. Alignment of the hydrogen molecule under intense laser fields. J Chem Phys 2017; 147:013948. [PMID: 28688451 DOI: 10.1063/1.4989935] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Alignment of the electronically excited E,F state of the H2 molecule is studied using the velocity mapping imaging technique. Photofragment images of H+ due to the dissociation mechanism that follows the 2-photon excitation into the (E,F; ν = 0, J = 0) electronic state show a strong dependence on laser intensity, which is attributed to the high polarizability anisotropy of the H2 (E,F) state. We observe a marked structure in the angular distribution, which we explain as the interference between the prepared J = 0 and Stark-mixed J = 2 rovibrational states of H2, as the laser intensity increases. Quantification of these effects allows us to extract the polarizability anisotropy of the H2 (E,F J = 0) state yielding a value of 312 ± 82 a.u. (46 Å3). By comparison, CS2 has 10 Å3, I2 has 7 Å3, and hydrochlorothiazide (C7H8ClN3O4S2) has about 25 Å3 meaning that we have created the most easily aligned molecule ever measured, by creating a mixed superposition state that is highly anisotropic in its polarizability.
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Affiliation(s)
- Gary V Lopez
- Combustion Research Facility, Sandia National Laboratories, Livermore, California 94550, USA
| | - Martin Fournier
- Combustion Research Facility, Sandia National Laboratories, Livermore, California 94550, USA
| | - Justin Jankunas
- Combustion Research Facility, Sandia National Laboratories, Livermore, California 94550, USA
| | - Alexandros K Spiliotis
- Department of Physics, University of Crete, and Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, Heraklion, Crete 70013, Greece
| | - T Peter Rakitzis
- Department of Physics, University of Crete, and Institute of Electronic Structure and Laser, Foundation for Research and Technology-Hellas, Heraklion, Crete 70013, Greece
| | - David W Chandler
- Combustion Research Facility, Sandia National Laboratories, Livermore, California 94550, USA
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Rudolph H, Urbain X. Vibrational branching ratios for single-photon ionization of Na2. PHYSICAL REVIEW. A, ATOMIC, MOLECULAR, AND OPTICAL PHYSICS 1996; 53:4111-4119. [PMID: 9913375 DOI: 10.1103/physreva.53.4111] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/11/2023]
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Dehmer JL, Dehmer PM, Pratt ST, Tomkins FS, O’Halloran MA. Rotational state distributions from vibrational autoionization of H2. J Chem Phys 1989. [DOI: 10.1063/1.456341] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Sen N, Dastidar KR, Dastidar TK. Effect of laser intensity on (2+1)-photon ionization of the hydrogen molecule via the E,F 1 Sigma g state. PHYSICAL REVIEW. A, GENERAL PHYSICS 1988; 38:841-848. [PMID: 9900448 DOI: 10.1103/physreva.38.841] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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O’Halloran MA, Dehmer PM, Tomkins FS, Pratt ST, Dehmer JL. Vibrational branching ratios following two‐color excitation of autoionizingnpRydberg states of H2. J Chem Phys 1988. [DOI: 10.1063/1.455463] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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