Excitations from dissociative fragments produced in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mi mathvariant="normal">H</mml:mi><mml:mo>+</mml:mo></mml:msup><mml:mo>+</mml:mo><mml:msub><mml:mi mathvariant="normal">H</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="normal">O</mml:mi></mml:mrow></mml:math>collisions

Monce, Michael N.; Pan, Sihui; Radeva, Nadezhda L.; Pepper, Jaime L.

doi:10.1103/physreva.79.012704

Cited by 2 publications

(5 citation statements)

References 15 publications

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“…As indicated earlier, the only previous Balmer emission crosssection study (for proton impact) was done by Yousif et al [9] who presented projectile and target H α emission cross sections in the energy range of 5 to 100 keV. Our previous work [5] indicated that our target H α cross section at 200 keV was not consistent with an extrapolated value on Yousif's results. This trend continues for energies from 50 to 100 keV, where there is still a disagreement by approximately a factor of 10 at each energy.…”

Section: A Target Balmer Emissionmentioning

confidence: 52%

“…In our previous work [5] we reported on cross sections from proton impact with H 2 O at a single energy of 200 keV. In this paper we show the energy dependence of both the target emission cross sections and the projectile emission cross sections due to electron capture (charge transfer).…”

Section: Introductionmentioning

confidence: 85%

“…The experimental setup and methods were generally the same as those used in our earlier work [5]. Using a Pelletron accelerator, we produced a proton beam collimated to a diameter of 3 mm incident on a differentially pumped target chamber, with regulated gas pressure kept under singlecollision conditions.…”

Section: Experimental Detailmentioning

confidence: 99%

“…The H δ Doppler-shifted lines were not clearly visible throughout the entire energy range. Since we did not study emission from charge transfer in our previous work [5], we present a general overview of the possible interaction processes here. For single electron capture, the following processes are possible [23]:…”

Section: B Projectile Balmer Emissionmentioning

confidence: 99%

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Analysis of photon emission from 50--350-keV proton impact onH2O

et al. 2011

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We have measured photon emission cross sections from neutral fragments produced by collisions of 50-350 keV protons with H 2 O molecules. Balmer α−δ emissions from both the target and projectile were recorded. We also analyzed A 2 + − X 2 (0,0) and (1,0) emission from the excited OH fragment produced during target dissociation. Trends in the cross sections revealed two key properties of the collision process: (1) The Bethe theory accurately describes target emission from both H and OH fragments and (2) the ratio of any two Balmer emission cross sections for both the target and projectile can be approximated by simple functions of the respective optical oscillator strengths. Finally, we provide the Bethe fit parameters necessary to calculate the target emission cross sections at all nonrelativistic impact energies.

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Section: A Target Balmer Emissionmentioning

confidence: 52%

Section: Introductionmentioning

confidence: 85%

Section: Experimental Detailmentioning

confidence: 99%

Section: B Projectile Balmer Emissionmentioning

confidence: 99%

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Analysis of photon emission from 50--350-keV proton impact onH2O

et al. 2011

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“…22-24; these results are particularly relevant in cometary X-ray emission. Recently, the experiments have focused on the molecular fragmentation, [25][26][27][28][29][30][31] and some works 32,33 have measured both target and projectile Balmer emission after ion-H 2 O collisions. Previous theoretical works aimed at filling in the collisional database of interest for radiation damage.…”

Section: Introductionmentioning

confidence: 99%

Study of Inelastic Processes in Ion-H₂O Collisions Using Classical Trajectory Monte Carlo and Semiclassical Methods

Errea¹,

Illescas²,

Gabás³

et al. 2012

Interdisciplinary Research on Particle Collisions and Quantitative Spectroscopy

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We present calculations of cross sections for one-and two-electron processes in collisions of H + , He 2+ and C 6+ with water molecules. We employ two kind of methods: a classical trajectory Monte Carlo approach and a semiclassical treatment with expansions in terms of molecular wavefunctions. Anisotropy effects related to the structure of the target are explicitly incorporated by using a three-center model potential to describe the electron-H2O + interaction. This is compared with a simple approach that employs a screened Coulomb potential. At high energies we derive scaling laws with respect to the projectile charge. We also estimate cross sections for molecular fragmentation subsequent to electron removal.

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Excitations from dissociative fragments produced inH++H2Ocollisions

Cited by 2 publications

References 15 publications

Analysis of photon emission from 50--350-keV proton impact onH2O

Analysis of photon emission from 50--350-keV proton impact onH2O

Study of Inelastic Processes in Ion-H₂O Collisions Using Classical Trajectory Monte Carlo and Semiclassical Methods

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Excitations from dissociative fragments produced inH++H2Ocollisions

Cited by 2 publications

References 15 publications

Analysis of photon emission from 50--350-keV proton impact onH2O

Analysis of photon emission from 50--350-keV proton impact onH2O

Study of Inelastic Processes in Ion-H2O Collisions Using Classical Trajectory Monte Carlo and Semiclassical Methods

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Product

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About

Study of Inelastic Processes in Ion-H₂O Collisions Using Classical Trajectory Monte Carlo and Semiclassical Methods