Balmer-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi></mml:math>and Balmer-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>β</mml:mi></mml:math>emission cross sections for H+Ar collisions

Zyl, B. Van; Neumann, H; Rothwell, H. L.; Amme, Robert C.

doi:10.1103/physreva.21.716

Cited by 32 publications

(16 citation statements)

References 21 publications

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“…Nevertheless a polarization correction is required. Van Zyl et al [21][22][23] have measured the polarization of H (n = 3, 4 → 2) radiations in a collisions of H + and H with noble gases. The polarizations of these lines vary between 5 and 30…”

Section: Methodsmentioning

confidence: 99%

Interactions of protons with furan molecules studied by collision-induced emission spectroscopy at the incident energy range of 50–1000 eV

Wąsowicz

Pranszke

2016

Eur. Phys. J. D

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Abstract.Investigations of the ion-molecule reactions provide insight into many fields ranging from the stellar wind interaction with interstellar media, up to medicine and industrial applications. Besides the applications, the understanding of these processes is itself a problem of fundamental importance. Thus, interactions of protons with the gas-phase furan molecules have been investigated for the first time in the energy range of 50-1000 eV exploiting collision-induced emission spectroscopy. Recorded spectra reveal emission of the atomic H β to H θ lines of the hydrogen Balmer series and the molecular bands of vibrationally and rotationally excited diatomic CH fragments created in the A 2 Δ and B 2 Σ − electronic states. The measurements of the emission yields of the excited fragments by recording their intensities at different projectile energies have been performed. The highest yields have been observed for production of hydrogen atoms which intensities rapidly decreased with increasing principal quantum number n. From the H (n = 4-7) intensity ratios depopulation factors of hydrogen excited states have been determined at each impact energy and possible collisional mechanisms leading to enhanced production of the hydrogen atoms have been suggested. We compare and discuss our results with improved data set of proton collisions with tetrahydrofuran (THF) molecules, the hydrogenated derivatives of furan.

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Section: Methodsmentioning

confidence: 99%

Interactions of protons with furan molecules studied by collision-induced emission spectroscopy at the incident energy range of 50–1000 eV

Wąsowicz

Pranszke

2016

Eur. Phys. J. D

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“…Visible and UV light emission were observed in the case of H atom or ion collisions with rare gas atoms [31][32][33][34] and this even at energies as low as ϳ10 eV. Metastable atoms and VUV emission have been observed in collisions between rare gas ions and atoms as well as between two neutral rare gas atoms.…”

Section: Neutralizationmentioning

confidence: 99%

Electronic excitations induced by the impact of coinage metal ions and clusters on a rare gas matrix: Neutralization and luminescence

et al. 2007

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Low-energy collisions of atomic ions and cluster ions with rare gas covered metal substrates can lead to strong light emission which is element and size specific. Instead of a direct energy transfer into the electronic system of the cluster the observed emission originates from excitons trapped in the rare gas layer which carries the excitation energy. The nature of the processes involved in the neutralization and excitation of the neutral clusters electronic system are discussed. Strong analogies to thermoluminescence are found.

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“…Here, Rg is the ground state of the noble gas (He, Ne, Ar, Kr or Xe) and H f and H data appears by comparison of excitation cross sections of the H atom by collisions with noble gas atoms [18,19,20] …”

Section: Discussionmentioning

confidence: 99%

Emission of fast non-Maxwellian hydrogen atoms in low-density laboratory plasma

Brandt

Marchuk

Pospieszczyk

et al. 2017

AIP Conference Proceedings

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Abstract. The source of strong and broad emission of the Balmer-α line in mixed plasmas of hydrogen (or deuterium) and noble gases in front of metallic surfaces is a subject of controversial discussion of many plasma types. In this work the excitation source of the Balmer lines is investigated by means of optical emission spectroscopy in the plasma device PSI-2. Neutral fast non-Maxwellian hydrogen atoms are produced by acceleration of hydrogen ions towards an electrode immersed into the plasma. By variation of the electrode potential the energy of ions and in turn of reflected fast atoms can be varied in the range of 40 − 300 eV. The fast atoms in front of the electrode are observed simultaneously by an Echelle spectrometer (0.001 nm/channel) and by an imaging spectrometer (0.01 nm/channel) up to few cm in the plasma. Intense excitation channels of the Balmer lines are observed when hydrogen is mixed with argon or with krypton. Especially in Ar-H and Ar-D mixed plasmas the emission of fast hydrogen atoms is very strong. Intermixing hydrogen with other noble gases (He, Ne or Xe) one observes the same effect however the emission is one order of magnitude less compared to Kr-H or Kr-D plasmas. It is shown, that the key process, impacting this emission, is the binary collision between the fast neutral hydrogen atom and the noble gas atom. Two possible sources of excitation are discussed in details: one is the excitation of hydrogen atoms by argon atoms in the ground state and the second one is the process of the so-called excitation transfer between the metastable states of noble gases and hydrogen. In the latter case the atomic data for excitation of Balmer lines are still not available in literature. Further experimental investigations are required to conclude on the source process of fast atom emission.

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Balmer-αand Balmer-βemission cross sections for H+Ar collisions

Cited by 32 publications

References 21 publications

Interactions of protons with furan molecules studied by collision-induced emission spectroscopy at the incident energy range of 50–1000 eV

Interactions of protons with furan molecules studied by collision-induced emission spectroscopy at the incident energy range of 50–1000 eV

Electronic excitations induced by the impact of coinage metal ions and clusters on a rare gas matrix: Neutralization and luminescence

Emission of fast non-Maxwellian hydrogen atoms in low-density laboratory plasma

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