| Zugriffsnummer | 48167 |
| Dokumenttyp | Zeitschriftenartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Kontinuumsstrahlung des einfach ionisierten Helium-Plasmas im Spektralbereich von 300 nm bis 650 nm |
| Übersetzungstitel | Continuum radiation of a single ionized helium-plasma in the spectral range 300 nm to 650 nm |
| Autor(in); Institution |
Einfeld, D.; PTB-Berlin
Sauerbrey, Günter; PTB-Berlin
|
| Quelle/Jahr | Zeitschrift für Naturforschung A: 30 (1975), 11, 1413 - 1424 |
| ISSN | 0932-0784 (PRINT) ; 1865-7109 (ONLINE) |
| DOI | |
| Verlag | Berlin: De Gruyter |
| Zusammenfassung | The radiation emitted from a wall stabilized helium-plasma (ne ≈ 3 · 1022 m-3, T ≈ 38000 K, duration of constant discharge current 0.4 ms) was investigated in the wavelength range 300 nm to 650 nm. From the emission coefficients of the continuum radiation Gaunt factors for the state with the principal quantum number 3 and the state 2 3 P were determined. Gaunt factors for the terms 2 1S, 2 1P, 2 3S and 2 3P were calculated from the transition probabilities of highly excited states. Agreement to within the accuracy of the measurement was found between the experimental results and the Gaunt factors evaluated from the photoionisation cross-sections calculated by Goldberg. The Gaunt factors for the states 2 1P and 2 3S according to Anderson and Griem are in good agreement with our results; for the terms 2 3P and 2 1S a discrepancy exists. With the Gaunt factors reported here electron densities in a helium-plasma can be determined with a relative uncertainty of 10%. The ξ-factor calculated by Kriener and Schlüter could be confirmed, if Bremsstrahlung of neutral atoms is neglected. |
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