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Title: Computational simulations of hydrogen circular migration in protonated acetylene induced by circularly polarized light

Journal Article · · Journal of Chemical Physics
DOI:https://doi.org/10.1063/1.4961644· OSTI ID:1467879

The hydrogens in protonated acetylene are very mobile and can easily migrate around the C2 core by moving between classical and non-classical structures of the cation. The lowest energy structure is the T-shaped, non-classical cation with a hydrogen bridging the two carbons. Conversion to the classical H2CCH+ ion requires only 4 kcal/mol. The effect of circularly polarized light on the migration of hydrogens in oriented C2H3+ has been simulated by Born-Oppenheimer molecular dynamics. Classical trajectory calculations were carried out with the M062X/6-311+G(3df,2pd) level of theory using linearly and circularly polarized 32 cycle 7 μm cosine squared pulses with peak intensity of 5.6 × 1013 W/cm2 and 3.15 × 1013 W/cm2, respectively. These linearly and circularly polarized pulses transfer similar amounts of energy and total angular momentum to C2H3+. The average angular momentum vectors of the three hydrogens show opposite directions of rotation for right and left circularly polarized light, but no directional preference for linearly polarized light. This difference results in an appreciable amount of angular displacement of the three hydrogens relative to the C2 core for circularly polarized light, but only an insignificant amount for linearly polarized light. In conclusion, over the course of the simulation with circularly polarized light, this corresponds to a propeller-like motion of the three hydrogens around the C2 core of protonated acetylene.

Research Organization:
Wayne State Univ., Detroit, MI (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC0012628
OSTI ID:
1467879
Alternate ID(s):
OSTI ID: 1312052
Journal Information:
Journal of Chemical Physics, Vol. 145, Issue 8; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 4 works
Citation information provided by
Web of Science

References (43)

Quartic Force Field Rovibrational Analysis of Protonated Acetylene, C 2 H 3 + , and Its Isotopologues journal August 2014
Molecular Dynamics in Strong Laser Fields: A New Algorithm for ab Initio Classical Trajectories journal July 2013
The energy separation between the classical and nonclassical isomers of protonated acetylene. An extensive study in one‐ and n ‐particle space journal June 1991
Experimental evidence for anomalous nuclear delocalization in C 2 H 3 + journal December 1993
On non‐RRKM unimolecular kinetics: Molecules in general, and CH 3 NC in particular journal November 1973
The Effect of Quantum and Thermal Fluctuations on the Structure of the Floppy Molecule C2H3+ journal January 1996
Ab initio classical trajectories on the Born–Oppenheimer surface: Updating methods for Hessian-based integrators journal November 1999
Protonated acetylene revisited journal January 2007
The Roaming Atom: Straying from the Reaction Path in Formaldehyde Decomposition journal November 2004
Infrared Spectroscopy of Carboions. 8. Hollow Cathode Spectroscopy of Protonated Acetylene, C2H3+ journal October 1995
Ultrafast hydrogen scrambling in methylacetylene and methyl-d3-acetylene ions induced by intense laser fields journal January 2012
Effect of Laser Parameters on Ultrafast Hydrogen Migration in Methanol Studied by Coincidence Momentum Imaging journal October 2011
Bond-Selective Dissociation of Polyatomic Cations in Mid-Infrared Strong Fields journal October 2013
Ultrafast Extreme Ultraviolet Induced Isomerization of Acetylene Cations journal December 2010
Ultrafast hydrogen migration in allene in intense laser fields: Evidence of two-body Coulomb explosion journal February 2009
HCO+ dissociation in a strong laser field: An ab initio classical trajectory study journal May 2012
Structural Dynamics of Protonated Methane and Acetylene journal February 1995
Molecular dynamics of methanol cation (CH 3 OH + ) in strong fields: Comparison of 800 nm and 7 μm laser fields journal August 2014
Efficient ejection of H3+ from hydrocarbon molecules induced by ultrashort intense laser fields journal September 2008
Vibrational Energy Flow in Highly Excited Molecules:  Role of Intramolecular Vibrational Redistribution journal January 1996
Two-body Coulomb explosion and hydrogen migration in methanol induced by intense 7 and 21fs laser pulses journal September 2007
Self‐consistent molecular orbital methods. XX. A basis set for correlated wave functions journal January 1980
Classical Dynamics Methods for High Energy Vibrational Spectroscopy journal October 1992
Steering Proton Migration in Hydrocarbons Using Intense Few-Cycle Laser Fields journal May 2016
Theoretical study of structures and energies of acetylene, ethylene, and vinyl radical and cation journal June 1988
Infrared spectroscopy of carbo‐ions. V. Classical vs nonclassical structure of protonated acetylene C 2 H + 3 journal November 1989
The M06 suite of density functionals for main group thermochemistry, thermochemical kinetics, noncovalent interactions, excited states, and transition elements: two new functionals and systematic testing of four M06-class functionals and 12 other functionals journal July 2007
Roaming Radicals journal May 2011
A CAS SCF CI study of the hydrogen migration potential in protonated acetylene, C2H3+ journal January 1987
Self‐consistent molecular orbital methods 25. Supplementary functions for Gaussian basis sets journal April 1984
Potential energy surface and MULTIMODE vibrational analysis of C2H3+ journal December 2006
Experimental versus simulated Coulomb-explosion images of flexible molecules: Structure of protonated acetylene C 2 H 3 + journal February 2003
Multiphoton Dissociation of Polyatomic Molecules journal October 1979
Photoelectron-Photoion Momentum Spectroscopy as a Clock for Chemical Rearrangements: Isomerization of the Di-Cation of Acetylene to the Vinylidene Configuration journal June 2003
Controlling Chemical Reactions by Short, Intense Mid-Infrared Laser Pulses: Comparison of Linear and Circularly Polarized Light in Simulations of ClCHO + Fragmentation journal February 2016
The classical and nonclassical forms of protonated acetylene, C 2 H + 3 . Structures, vibrational frequencies, and infrared intensities from explicitly correlated wave functions journal September 1986
Molecular Dynamics of Methylamine, Methanol, and Methyl Fluoride Cations in Intense 7 Micron Laser Fields journal October 2014
Communication: Two stages of ultrafast hydrogen migration in methanol driven by intense laser fields journal August 2010
Roaming Atoms and Radicals: A New Mechanism in Molecular Dissociation journal July 2008
A Reaction Accelerator: Mid-infrared Strong Field Dissociation Yields Mode-Selective Chemistry journal August 2012
Tabletop imaging of structural evolutions in chemical reactions demonstrated for the acetylene cation journal July 2014
The roaming atom pathway in formaldehyde decomposition journal July 2006
Higher-accuracy schemes for approximating the Hessian from electronic structure calculations in chemical dynamics simulations journal August 2010

Cited By (1)