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The M-Series Absorption Spectra of Metallic Platinum and Gold

1929; American Institute of Physics; Volume: 34; Issue: 8 Linguagem: Inglês

10.1103/physrev.34.1106

1536-6065

Arthur J. M. Johnson,

Advanced Chemical Physics Studies

The $M$-absorption spectra of metallic platinum (78) and gold (79) have been investigated by the use of a vacuum spectrograph. Five discontinuities were found for platinum at 5.711A (${M}_{1}$), 5.506A (${M}_{2}$), 4.677A (${M}_{3}$), 4.085A (${M}_{4}$), and 3.742A (${M}_{5}$). For gold four were found at 5.506A (${M}_{1}$), 5.315A (${M}_{2}$), 4.501A (${M}_{3}$) and 3.603A (${M}_{5}$). No ${M}_{4}$ discontinuity was found for gold and the ${M}_{4}$ for platinum was very faint. The ${(\frac{\ensuremath{\nu}}{R})}^{\frac{1}{2}}$ values for the experimentally determined edges compare very favorably with the values predicted by the use of absorption and emission data from the $L$-series except in the case of ${M}_{1}$ and ${M}_{2}$ where an unmistakable deviation, previously reported by other investigators on other elements, appears to be confirmed. No measurable shift in the position of any of the discontinuities due to a change in valence of four, in the case of the platinum atom, was observed. No "white line" absorption was observed at any of the discontinuities.