Resonances in the Photo-ionization Continuum of Ar i (20-150 eV)
Resonances in the Photo-ionization Continuum of Ar i (20-150 eV)
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Ar i (20-150 eV) 光电离连续体中的共振
DOI：
10.1103/physrev.177.136
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发表时间：
1969
期刊：
影响因子：
--
通讯作者：
K. Codling
中科院分区：
文献类型：
--
作者：
R. Madden;D. Ederer;K. Codling
The absorption spectrum of argon in the region 600-80 \AA{} (20-150 eV) has been studied photographically and photoelectrically, using synchrotron light as a background source and a resolution of 0.06 \AA{}. Many resonances have been observed in the photo-ionization continuum, which are caused by electronic excitation to auto-ionizing states of Ar i. In the region between 27 and 40 eV the observed structure is due to two types of electronic excitation: (i) the excitation of a single $3s$ electron, resulting in the configuration $3s3{p}^{6}\mathrm{np}$ and (ii) the excitation of two of the outer $3p$ electrons simultaneously, resulting in configurations of the type $3{s}^{2}3{p}^{4}\mathrm{nl}{n}^{\ensuremath{'}}{l}^{\ensuremath{'}}$. Between 44 and 59 eV, weak structures have been observed in the absorption continuum because of the simultaneous excitation of a $3s$ and a $3p$ electron, resulting in configurations of the type $3s3{p}^{5}\mathrm{nl}{n}^{\ensuremath{'}}{l}^{\ensuremath{'}}$. All of the observed resonances have been tabulated, and a partial classification has been given. The profiles of the resonances involving states $3s3{p}^{6}\mathrm{np}{^{1}P_{1}}^{\ensuremath{\circ}}$, for $n=4, 5, \mathrm{and} 6$, and the two-electron excitation states $3{s}^{2}3{p}^{4}(^{3}P)4s(^{2}P_{\frac{3}{2}})4p$ and $3{s}^{2}3{p}^{4}(^{3}P)3d(^{2}P_{\frac{3}{2}})4p$, have been studied quantitatively. The values of $q$, ${\ensuremath{\rho}}^{2}$, and $\ensuremath{\Gamma}$ have been determined for each of these resonances, and the continuum cross section has been measured between 24 and 36 eV.
The absorption spectrum of argon in the region 600-80 \AA{} (20-150 eV) has been studied photographically and photoelectrically, using synchrotron light as a background source and a resolution of 0.06 \AA{}. Many resonances have been observed in the photo-ionization continuum, which are caused by electronic excitation to auto-ionizing states of Ar i. In the region between 27 and 40 eV the observed structure is due to two types of electronic excitation: (i) the excitation of a single $3s$ electron, resulting in the configuration $3s3{p}^{6}\mathrm{np}$ and (ii) the excitation of two of the outer $3p$ electrons simultaneously, resulting in configurations of the type $3{s}^{2}3{p}^{4}\mathrm{nl}{n}^{\ensuremath{'}}{l}^{\ensuremath{'}}$. Between 44 and 59 eV, weak structures have been observed in the absorption continuum because of the simultaneous excitation of a $3s$ and a $3p$ electron, resulting in configurations of the type $3s3{p}^{5}\mathrm{nl}{n}^{\ensuremath{'}}{l}^{\ensuremath{'}}$. All of the observed resonances have been tabulated, and a partial classification has been given. The profiles of the resonances involving states $3s3{p}^{6}\mathrm{np}{^{1}P_{1}}^{\ensuremath{\circ}}$, for $n=4, 5, \mathrm{and} 6$, and the two-electron excitation states $3{s}^{2}3{p}^{4}(^{3}P)4s(^{2}P_{\frac{3}{2}})4p$ and $3{s}^{2}3{p}^{4}(^{3}P)3d(^{2}P_{\frac{3}{2}})4p$, have been studied quantitatively. The values of $q$, ${\ensuremath{\rho}}^{2}$, and $\ensuremath{\Gamma}$ have been determined for each of these resonances, and the continuum cross section has been measured between 24 and 36 eV.