open access

https://hdl.handle.net/2115/5914

Observation and mechanism of photon emission at metal-solution interfaces

英語

1993

American Physical Society

PHYSICAL REVIEW B

47(4)

2278-2288

Photon emission from a metal surface (Au and Pt) induced by electron-transfer reactions was observed in an electrolyte solution containing solvated electrons. The quantum efficiency Φ increases as the electrode potential Uw becomes positive. The high-energy threshold of the spectrum, Eth, increases linearly with increasing Uw at the rate of 1 eV/V. The relaxation energy of solvated electrons in the electrolyte solution is estimated from the values of Eth and Uw. The peak energy Ep of the spectrum also increases as Uw becomes positive although the magnitude of the shift is much smaller than that of Eth. Ep and the low-energy threshold El of the spectrum are metal dependent. The emitted-photon spectra are simulated by considering the transition between bulk band states of the metal while ignoring k-vector conservation. The simulated results are compared with experiment and the validity of this model is discussed.

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Copyright © 1993 American Physical Society

0163-1829