Orientation dependence of multiple ionisation of a diatomic molecule under proton impact

Sharma, Deepak; Bapat, B.; Bhatt, Pragya; Safvan, C. P.

doi:10.1088/1361-6455/ab17ee

Cited by 2 publications

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References 47 publications

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“…It is clear from the angular distribution of O + and S + that ionisation probability is high for the orientation in which the oxygen atom points towards the projectile. The result is similar for the CO molecule, reported in our earlier papers [22,23]. For C 2+ impact, high negative value of the anisotropy parameter indicates a higher ionisation probability for the perpendicular orientation of the molecule and thus in this case no forward-backward asymmetry can be expected.…”

Section: Three-body Fragmentationsupporting

confidence: 88%

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Triple ionisation of OCS: orientation dependence in the case of ion impact

Sharma

Bapat

Bhatt

et al. 2020

J. Phys. B: At. Mol. Opt. Phys.

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The dependence of the cross-section for multiple ionisation on the orientation of free molecules with respect to the incident projectile has long been demonstrated in the case of diatomic molecules. The dependence has been studied via the coincidence momentum imaging technique, where, under the axial recoil approximation, the orientation of the molecule with respect to the incident projectile is determined from the measured momentum vectors of fragments, which, for diatomic molecules, are necessarily emitted back-to-back. The case of triatomic molecules is complicated owing to the possibility of simultaneous or step-wise breaking of the two bonds, precluding a simple mapping of the fragment momentum vectors to the initial orientation. We report a measurement of triple ionisation of an asymmetric triatomic molecule, OCS, which clearly shows, that the process indeed has an orientation dependence similar to that in diatomic molecules. As expected from the studies on diatomic molecules, the dependence is stronger for small values of q/v and negligible for large values of q/v, where q and v are the projectile charge and velocity, respectively.

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Section: Three-body Fragmentationsupporting

confidence: 88%

“…In recent papers [22,23], we have discussed the orientation dependence of multiple ionisation of the CO molecule. Together with anisotropy, asymmetry was observed, owing to the heteronuclear nature of CO molecule.…”

Section: Introductionmentioning

confidence: 99%

Triple ionisation of OCS: orientation dependence in the case of ion impact

Sharma

Bapat

Bhatt

et al. 2020

J. Phys. B: At. Mol. Opt. Phys.

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Design and characterization of a recoil ion momentum spectrometer for investigating molecular fragmentation dynamics upon MeV energy ion impact ionization

Duley

Tyagi

Bari

et al. 2022

Review of Scientific Instruments

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We present the development and performance of a newly built recoil ion momentum spectrometer to study the fragmentation dynamics of ionized molecules. The spectrometer is based on the two-stage Wiley–McLaren geometry and satisfies both time and velocity focusing conditions. An electrostatic lens has been introduced in the drift region to achieve velocity imaging and higher angular collection. The spectrometer is equipped with a 2D position-sensitive detector with multi-hit coincidence electronics. Ionic fragments with kinetic energy ∼8 eV can be detected with 4 π collection. The overall performance of the spectrometer has been tested by carrying out three-dimensional ion imaging measurements for diatomic (N2) and polyatomic (CH2Cl2) molecules under the impact of 1 MeV protons. Three-dimensional momentum and kinetic energy release distributions were derived from the measured position and time-of-flight spectra. The observed features of the various fragmentation channels as well as the measured kinetic energy release distributions are in complete agreement with the available data.

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Orientation dependence of multiple ionisation of a diatomic molecule under proton impact

Cited by 2 publications

References 47 publications

Triple ionisation of OCS: orientation dependence in the case of ion impact

Triple ionisation of OCS: orientation dependence in the case of ion impact

Design and characterization of a recoil ion momentum spectrometer for investigating molecular fragmentation dynamics upon MeV energy ion impact ionization

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