Fluorescence of Interstitial Atomic Hydrogen in Alkali Halides Doped with I⁻

Abstract

and RbCl doped with I-interstitial atomic hydrogen shows fluorescence emission if one of the four chlorine neighbours is replaced by an I-. I n KCl one emission band at 2.84 eV with a radiative decay time of 14 ns and two overlapping bands at 1.97 eV with decay times of 34 ns and 720 ns (at 4 K) are observed. Similar results are found for RbCI. The results are interpreted as due to two charge transfer type relaxed excited states, one of which is a spin quartet and responsible for the long radiative lifetime.I n mit I-dotiertem KCI and RbCl zeigt atomarer Wasserstoff auf Znischengitterplatz dann eine Fluoreszenzemission, wenn einer der vier Chlornachbarn durch ein I-ersetzt ist. I n KCI werden eine Emissionsbande bei 2,84 eV mit einer Abklingdauer von 14 ns und zwei sich uberlagernde Banden bei 1,97 eV mit Abklingdauern von 34 ns bzw. 720 ns (bei 4 K) beobachtet. Die Interpretation fuhrt auf zwei relaxierte. angeregte Charge-Transfer-Zustande, von denen einer als SpinQuartett fur die lange Lebensdauer verantwortlich ist.

Muonium fluorescence: Anomalous muonium center and relaxed excited state in KBr

“…A hint is that fluorescence has been observed from the interstitial hydrogen centers in alkali halides doped with I~, where the spin quartet of the chargetransfer-type relaxed excited states (i.e., H,~-fI^) are responsible for the long radiative lifetime (~10~^ s) [17]. One of the possible analogs for the Mu' is then the spin multiplet of the charged states coupled with surrounding halogen atoms [18,19], though the observed small shift for the Mu' hf parameter might be hard to explain by this model.…”