Detailed H(n=2) density measurements in a magnetized hydrogen plasma jet

W.E.N. Harskamp, van, C.M. Brouwer, D.C. Schram, M.C.M. Sanden, van de, R.A.H. Engeln

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We present detailed spatial density measurements of H(n = 2), i.e. the first excited state of atomic hydrogen, in a hydrogen plasma expansion that is weakly magnetized. At a specific distance from the source of the expansion a sharp transition from a red light emitting plasma (dominated by Ha emission) to a blue light emitting plasma (dominated by Hß and H¿ emission) occurs. Molecular processes such as dissociative recombination and processes with negative ions are suspected to be key in the understanding of the distinct emissions observed in the two different plasma regions. The relevance of the presented work is to underline these molecular processes in atomic regimes of hydrogen-containing plasmas. The first excited state density, n = 2, is determined with tunable diode laser absorption spectroscopy on the Balmer-alpha transition to investigate how important molecular processes such as dissociative recombination are in the plasma. The density of n = 2 is 1 × 1017 m-3 close to the plasma source and decreases gradually along the plasma column to 1014 m-3 at 20 cm from the plasma source exit. The presented results show that the theoretical possibility to generate a stable hydrogen laser in the visible light, i.e. population inversion of n = 3 with respect to n = 2, is not obtained due to the population of n = 2 by dissociative recombination of ions. The presence of molecular processes in the plasma is further evidenced with the use of a collisional radiative model.
Originele taal-2Engels
Artikelnummer024009
Pagina's (van-tot)024009-1/9
Aantal pagina's9
TijdschriftPlasma Sources Science and Technology
Volume21
Nummer van het tijdschrift2
DOI's
StatusGepubliceerd - 2012

Vingerafdruk

hydrogen plasma
plasma jets
expansion
population inversion
hydrogen
laser spectroscopy
negative ions
excitation
absorption spectroscopy
diodes
lasers

Citeer dit

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title = "Detailed H(n=2) density measurements in a magnetized hydrogen plasma jet",
abstract = "We present detailed spatial density measurements of H(n = 2), i.e. the first excited state of atomic hydrogen, in a hydrogen plasma expansion that is weakly magnetized. At a specific distance from the source of the expansion a sharp transition from a red light emitting plasma (dominated by Ha emission) to a blue light emitting plasma (dominated by H{\ss} and H¿ emission) occurs. Molecular processes such as dissociative recombination and processes with negative ions are suspected to be key in the understanding of the distinct emissions observed in the two different plasma regions. The relevance of the presented work is to underline these molecular processes in atomic regimes of hydrogen-containing plasmas. The first excited state density, n = 2, is determined with tunable diode laser absorption spectroscopy on the Balmer-alpha transition to investigate how important molecular processes such as dissociative recombination are in the plasma. The density of n = 2 is 1 × 1017 m-3 close to the plasma source and decreases gradually along the plasma column to 1014 m-3 at 20 cm from the plasma source exit. The presented results show that the theoretical possibility to generate a stable hydrogen laser in the visible light, i.e. population inversion of n = 3 with respect to n = 2, is not obtained due to the population of n = 2 by dissociative recombination of ions. The presence of molecular processes in the plasma is further evidenced with the use of a collisional radiative model.",
author = "{Harskamp, van}, W.E.N. and C.M. Brouwer and D.C. Schram and {Sanden, van de}, M.C.M. and R.A.H. Engeln",
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Detailed H(n=2) density measurements in a magnetized hydrogen plasma jet. / Harskamp, van, W.E.N.; Brouwer, C.M.; Schram, D.C.; Sanden, van de, M.C.M.; Engeln, R.A.H.

In: Plasma Sources Science and Technology, Vol. 21, Nr. 2, 024009, 2012, blz. 024009-1/9.

Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

TY - JOUR

T1 - Detailed H(n=2) density measurements in a magnetized hydrogen plasma jet

AU - Harskamp, van, W.E.N.

AU - Brouwer, C.M.

AU - Schram, D.C.

AU - Sanden, van de, M.C.M.

AU - Engeln, R.A.H.

PY - 2012

Y1 - 2012

N2 - We present detailed spatial density measurements of H(n = 2), i.e. the first excited state of atomic hydrogen, in a hydrogen plasma expansion that is weakly magnetized. At a specific distance from the source of the expansion a sharp transition from a red light emitting plasma (dominated by Ha emission) to a blue light emitting plasma (dominated by Hß and H¿ emission) occurs. Molecular processes such as dissociative recombination and processes with negative ions are suspected to be key in the understanding of the distinct emissions observed in the two different plasma regions. The relevance of the presented work is to underline these molecular processes in atomic regimes of hydrogen-containing plasmas. The first excited state density, n = 2, is determined with tunable diode laser absorption spectroscopy on the Balmer-alpha transition to investigate how important molecular processes such as dissociative recombination are in the plasma. The density of n = 2 is 1 × 1017 m-3 close to the plasma source and decreases gradually along the plasma column to 1014 m-3 at 20 cm from the plasma source exit. The presented results show that the theoretical possibility to generate a stable hydrogen laser in the visible light, i.e. population inversion of n = 3 with respect to n = 2, is not obtained due to the population of n = 2 by dissociative recombination of ions. The presence of molecular processes in the plasma is further evidenced with the use of a collisional radiative model.

AB - We present detailed spatial density measurements of H(n = 2), i.e. the first excited state of atomic hydrogen, in a hydrogen plasma expansion that is weakly magnetized. At a specific distance from the source of the expansion a sharp transition from a red light emitting plasma (dominated by Ha emission) to a blue light emitting plasma (dominated by Hß and H¿ emission) occurs. Molecular processes such as dissociative recombination and processes with negative ions are suspected to be key in the understanding of the distinct emissions observed in the two different plasma regions. The relevance of the presented work is to underline these molecular processes in atomic regimes of hydrogen-containing plasmas. The first excited state density, n = 2, is determined with tunable diode laser absorption spectroscopy on the Balmer-alpha transition to investigate how important molecular processes such as dissociative recombination are in the plasma. The density of n = 2 is 1 × 1017 m-3 close to the plasma source and decreases gradually along the plasma column to 1014 m-3 at 20 cm from the plasma source exit. The presented results show that the theoretical possibility to generate a stable hydrogen laser in the visible light, i.e. population inversion of n = 3 with respect to n = 2, is not obtained due to the population of n = 2 by dissociative recombination of ions. The presence of molecular processes in the plasma is further evidenced with the use of a collisional radiative model.

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DO - 10.1088/0963-0252/21/2/024009

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