Formation, structure, and dissociation dynamics of CO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow /><mml:mn>2</mml:mn></mml:msub><mml:msup><mml:mrow /><mml:mrow><mml:mi>q</mml:mi><mml:mo>+</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>q</mml:mi><mml:mo>≤</mml:mo><mml:mn>3</mml:mn></mml:mrow></mml:math>) ions due to impact of 12-keV electrons

Bhatt, Pragya; Singh, Raj; Yadav, Namita; Shanker, Rama

doi:10.1103/physreva.85.042707

Cited by 23 publications

(17 citation statements)

References 44 publications

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“…Molecules undergo intricate chemical reactions when irradiated by strong laser fields − or impacted by ion − or electron , sources. Ultrafast processes like bond softening, hardening, and nuclear dissociation happen even in the simplest diatomic molecules.…”

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confidence: 99%

Femtosecond Resolving Photodissociation Dynamics of the SO₂ Molecule

Lin

Pan

et al. 2020

J. Phys. Chem. Lett.

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We experimentally investigate the ultrafast photodissociation dynamics of the SO 2 molecule induced by intense ultrashort laser pulses in a pump−probe scheme. Different three-body fragmentation pathways are discriminated using the time-dependent kinetic energy release spectrum with femtosecond time resolution. A nontrivial three-body fragmentation pathway, denoted as the bonding pathway, is unraveled, in which an intermediate fast rotating O 2 molecule is formed before complete fragmentation. The ultrafast chemical bond rearrangement after electron release is tracked in real time. The bonding pathway generally exists in the three-body fragmentation processes induced by strong laser fields of different wavelengths, which is observed in infrared, ultraviolet, and mixed two-color cases. Our findings are significant for understanding the photon-induced ultrafast processes of the SO 2 molecule in atmospheric chemistry.

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confidence: 99%

Femtosecond Resolving Photodissociation Dynamics of the SO₂ Molecule

Lin

Pan

et al. 2020

J. Phys. Chem. Lett.

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“…The RIFs for CO + , C + , and O + show reasonably good agreement with those at low-energy electron impact because they possibly arise from the dipole allowed transitions, whereas the mismatch in the RIF values for CO 2+ , C 2+ , O 2+ , and C 3+ may arise due to the involvement of the dipole nonallowed transitions. In our earlier experiments, we have also observed the large RIF for doubly charged ions [34,36]. It has been shown [41] that at higher impact energies the multiple ionization is governed mainly by Auger-likeautoionization processes followed by creation of a vacancy in the inner-shell molecular orbital.…”

Section: A Rifs and Precursor-specific Relative Picssmentioning

confidence: 63%

“…The RIFs, the precursor specific PICSs, and the involved errors are estimated by using the analysis procedures given in [34,36]. The overall uncertainties in the presented data for each ion single are 2.5%, <4%, 4%, 10%, 6%, 8%, and 15%, for CO + , C + , O + , CO 2+ , C 2+ , O 2+ , and C 3+ , respectively.…”

Section: Experimental Setup and Data Analysismentioning

confidence: 99%

Ionic fragmentation of the CO molecule by impact of 10-keV electrons: Kinetic-energy-release distributions

et al. 2013

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The ionic fragmentation of a multiply charged CO molecule is studied under impact of 10-keV electrons using recoil-ion momentum spectroscopy. The kinetic-energy-release distributions for the various fragmentation channels arising from the dissociation of CO q+ (q = 2-4) are measured and discussed in light of theoretical calculations available in the literature. It is observed that the present kinetic-energy-release values are much smaller than those predicted by the Coulomb explosion model. The kinetic-energy-release distribution for the C + + O + channel is suggested to arise from the tunneling process. It is seen that the peak of kinetic-energy-release distribution is larger for that dissociation channel that arises from the same molecular ion which has higher charge on the oxygen atom. Further, the relative ionic fractions for seven ion species originating from ionization and subsequent dissociation of the CO molecule are obtained and compared with the existing data reported at low energy of the electron impact. The precursor-specific relative partial ionization cross sections are also obtained and shown to be about 66.4% from single ionization, 29.9% from double ionization, 3.3% from triple ionization, and about 0.4% from quadruple ionization of the precursor CO molecule contributing to the total fragment ion yield.

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“…Till date, a number of theoretical and experimental investigations have been carried out using photons, 1-5 electrons, [6][7][8] and heavy ions [9][10][11][12] as probes to understand the breakup dynamics of molecules including, large biomolecules [13][14][15][16] or even free fullerene. [17][18][19][20][21] To tackle the complexity involved in the molecular break-up processes, it is necessary to have sophisticated, state-of-the-art, theoretical models and highly differential experimental measurements.…”

Section: Introductionmentioning

confidence: 99%

A recoil ion momentum spectrometer for molecular and atomic fragmentation studies

Khan

Tribedi

Misra

2015

Review of Scientific Instruments

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We report the development and performance studies of a newly built recoil ion momentum spectrometer for the study of atomic and molecular fragmentation dynamics in gas phase upon the impact of charged particles and photons. The present design is a two-stage Wiley-McLaren type spectrometer which satisfies both time and velocity focusing conditions and is capable of measuring singly charged ionic fragments up-to 13 eV in all directions. An electrostatic lens has been introduced in order to achieve velocity imaging. Effects of the lens on time-of-flight as well as on the position have been investigated in detail, both, by simulation and in experiment. We have used 120 keV proton beam on molecular nitrogen gas target. Complete momentum distributions and kinetic energy release distributions have been derived from the measured position and time-of-flight spectra. Along with this, the kinetic energy release spectra of fragmentation of doubly ionized nitrogen molecule upon various projectile impacts are presented.

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Formation, structure, and dissociation dynamics of CO2q+(q≤3) ions due to impact of 12-keV electrons

Cited by 23 publications

References 44 publications

Femtosecond Resolving Photodissociation Dynamics of the SO₂ Molecule

Femtosecond Resolving Photodissociation Dynamics of the SO₂ Molecule

Ionic fragmentation of the CO molecule by impact of 10-keV electrons: Kinetic-energy-release distributions

A recoil ion momentum spectrometer for molecular and atomic fragmentation studies

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Formation, structure, and dissociation dynamics of CO2q+(q≤3) ions due to impact of 12-keV electrons

Cited by 23 publications

References 44 publications

Femtosecond Resolving Photodissociation Dynamics of the SO2 Molecule

Femtosecond Resolving Photodissociation Dynamics of the SO2 Molecule

Ionic fragmentation of the CO molecule by impact of 10-keV electrons: Kinetic-energy-release distributions

A recoil ion momentum spectrometer for molecular and atomic fragmentation studies

Contact Info

Product

Resources

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Femtosecond Resolving Photodissociation Dynamics of the SO₂ Molecule

Femtosecond Resolving Photodissociation Dynamics of the SO₂ Molecule