Formic Acid Ionization and Fragmentation by Multiphoton Absorption

C. Cisneros; T.  Bautista; C. F.  Betancourt; E.  Prieto; A.  Guerrero; I.  Álvarez

doi:10.15415/jnp.2021.82026

Authors

C. Cisneros Institute of Physical Sciences, National Autonomous University of Mexico (UNAM)1001Av. Universidad S/N, Chamilpa, 62210, Cuernavaca, Morelos, México
T. Bautista Institute of Physical Sciences, National Autonomous University of Mexico (UNAM)1001Av. Universidad S/N, Chamilpa, 62210, Cuernavaca, Morelos, México
C. F. Betancourt Institute of Physical Sciences, National Autonomous University of Mexico (UNAM)1001Av. Universidad S/N, Chamilpa, 62210, Cuernavaca, Morelos, México
E. Prieto Institute of Physical Sciences, National Autonomous University of Mexico (UNAM)1001Av. Universidad S/N, Chamilpa, 62210, Cuernavaca, Morelos, México
A. Guerrero Institute of Physical Sciences, National Autonomous University of Mexico (UNAM)1001Av. Universidad S/N, Chamilpa, 62210, Cuernavaca, Morelos, México
I. Álvarez Institute of Physical Sciences, National Autonomous University of Mexico (UNAM)1001Av. Universidad S/N, Chamilpa, 62210, Cuernavaca, Morelos, México

DOI:

https://doi.org/10.15415/jnp.2021.82026

Keywords:

Laser Formic acid, Multiphoton, Dissociation, Ionization

Abstract

Multiphoton absorption is an intensity dependent nonlinear effect related to the excitation of virtual intermediate states. In the present work, multiphoton ionization and dissociation of the formic acid molecule (HCOOH) by the interaction with photons from 532 Nd: YAG laser at different intensities are discussed, using different carrier gases. The induced fragmentation-ionization patterns show up to 17 fragments and dissociation channels are proposed. Some evidence of small clusters formation and conformational memory from the ratio of the detected products, CO⁺ and CO₂⁺_, on the light of the available results, it is possible to conclude that they arise from trans and cis formic acid. Our results are compared with those obtained in other laboratories under different experimental conditions, some of them show only partial agreement and differences are discussed. Following the Keldysh description it is possible, from our experimental parameters, characterize our results, in the multiphoton absorption regime.

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