Experimental and theoretical double differential cross sections for electron impact ionization of methane

Yavuz, Metin; Ozer, Zehra Nur; Ulu, Melike; Champion, C.; Doğan, Mevlüt

doi:10.1063/1.4947591

Cited by 10 publications

(7 citation statements)

References 33 publications

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“…This approximation was first formulated with success to study electron capture for the case of atomic targets [39,40] and then extended to molecular targets [41]. This approximation has also been applied for electron ionization of atomic and molecular targets [42][43][44][45][46][47]. As the collision energies considered in this work (from 25 keV/amu up to several MeV/amu), the rotation and vibration periods of the molecule are larger than the collision time and it is a reasonable approximation to treat the nuclei as fixed during the collision.…”

Section: Theoretical Modelmentioning

confidence: 99%

Single-Capture Cross Sections from Biological Molecules and Noble Gases by Bare Ion Impact

et al. 2019

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In this work, we report theoretical electron capture cross sections for single-electron removal from molecules of biological interest and noble gases by bare ion (H + and H e 2+) impact at energies ranging from 25 to 10,000 keV/amu. We use a distorted wave (DW) method where the intermediate continuum state of the active electron with the target ion has been taken into account. This method is developed within the framework of the independent electron model taking particular care of the representation of the bound continuum target states. Two different approximations have been considered for molecular targets: molecular representation of the bound-state target wavefunction and Bragg's additivity rule. The molecular orbital for targets are described within the framework of the complete neglect of differential overlap (CNDO) method based on the linear combination of atomic orbital (LCAO) approximation. Using the DW method, we have also calculated the K-, Land M-shell electron capture in collisions of bare ions with three noble gases He, Ne, and Ar respectively. Contributions from different molecular orbitals and different shells to the total cross sections (TCS) are studied. The preference of electron capture occurs in accordance as the binding energy of the active electron in molecular orbital and atomic shell. The maximum contributions to TCS for SC comes from the less bound electrons in repetitive orbitals, whereas the tightly bound electrons dominate the TCS at higher projectile energy regime. Variation of TCS with impact energy are compared with the available experimental observation and other theoretical findings. We find that the present theoretical method is satisfactory in both intermediate and high-energy region for molecules as well as noble gas targets to give reliable outcomes compared to other theoretical methods.

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Section: Theoretical Modelmentioning

confidence: 99%

Single-Capture Cross Sections from Biological Molecules and Noble Gases by Bare Ion Impact

et al. 2019

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“…One of the advantages of using a molecular wave function centered at the heaviest nucleus, is the ability to perform analytically the average over all the molecular orientations given in equation (9). We remind that the molecular wave function given in equation (11) is defined in a molecular reference frame, were the main axis (i.e., the highest order axis of the molecule) is the Oz axis. However, in collision reference frame, the Oz axis is chosen in the direction of the incident electrons.…”

Section: ˆˆ| | ( )mentioning

confidence: 99%

“…Methane and ammonia molecules, like water molecule, are important targets to study from both experimental and theoretical aspects (see, for example, references from [10][11][12][13][14][15][16][17]). These molecules take an important part from the composition of some planetary atmospheres and interstellar medium [18].…”

Section: Introductionmentioning

confidence: 99%

Electron-impact ionization of the CH₄ and NH₃ molecules in coplanar symmetric and asymmetric geometries

Bouchikhi¹,

Sahlaoui²,

Lasri³

et al. 2018

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

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In the present paper, we study the single ionization of methane and ammonia molecules by electron-impact. Our analytical formalism developed in the framework of the first and second Born approximations and the one Coulomb wave model is used to compute the triple differential cross section. Experimental and theoretical results for high and intermediate energies are presented and compared in coplanar symmetric and asymmetric geometries. Good agreement is found between our results and the experimental ones.

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“…The (e, 2e) process is another name for electron impact ionization [2,3]. The ionization of the target becomes possible with the help of the (e, 2e) process [4][5][6][7][8][9][10]. The study of a coincident (e, 2e) process in different kinematical domains has helped to a great extent the investigation of the collision dynamics.…”

Section: Introductionmentioning

confidence: 99%

Theoretical triple differential cross sections for ionization of N ₂ and CH ₄ molecules by electron impact

Mondal,

Mandal,

Haque

et al. 2024

Phys. Scr.

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We present the angular distribution of electron emission by calculating the triple differential cross sections for (e, 2e) process on N2 and CH4 by using the three-body formalism of molecular first Born approximation (MFBA), two-Coulomb wave (M2CW), and three-Coulomb wave (M3CW) models, respectively. In these models, a Coulomb distorted wave is considered for the motion of the incident electron. We have considered the continuum-continuum correlation effect by choosing the final state as the three-Coulomb and two-Coulomb wave functions in M3CW and M2CW models, whereas the ejected electron is affected by a single centre field of the target in the MFBA model. In the M2CW model, the interaction between scattered electron-residual target ion has been described as a plane wave. The distinguishing feature among the three models has been noted in the TDCS as a strong binary peak with and without a recoil peak for several electron emission energies at fixed scattering angle. In the case of N2 molecule, the TDCS shows oscillatory behaviour with the variation of the electron emission angle. The positions of the binary peak obtained by our theoretical models are well established by the experimental findings, but a large deviation is found in the region of the recoil peak. The contributions of TDCS for different molecular orbitals of the molecules to the spectrum of angular distributions at different electron emission energies have also been analyzed. Finally, a comparison is made with the measurement in coplanar asymmetry geometry. Overall, good agreement was found between experiments and M3CW theory.

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Experimental and theoretical double differential cross sections for electron impact ionization of methane

Cited by 10 publications

References 33 publications

Single-Capture Cross Sections from Biological Molecules and Noble Gases by Bare Ion Impact

Single-Capture Cross Sections from Biological Molecules and Noble Gases by Bare Ion Impact

Electron-impact ionization of the CH₄ and NH₃ molecules in coplanar symmetric and asymmetric geometries

Theoretical triple differential cross sections for ionization of N ₂ and CH ₄ molecules by electron impact

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Experimental and theoretical double differential cross sections for electron impact ionization of methane

Cited by 10 publications

References 33 publications

Single-Capture Cross Sections from Biological Molecules and Noble Gases by Bare Ion Impact

Single-Capture Cross Sections from Biological Molecules and Noble Gases by Bare Ion Impact

Electron-impact ionization of the CH4 and NH3 molecules in coplanar symmetric and asymmetric geometries

Theoretical triple differential cross sections for ionization of N 2 and CH 4 molecules by electron impact

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Electron-impact ionization of the CH₄ and NH₃ molecules in coplanar symmetric and asymmetric geometries

Theoretical triple differential cross sections for ionization of N ₂ and CH ₄ molecules by electron impact