The observation of the first vibrational overtone of dihydrogen in the luminescence of zeolites at low temperatures.
Dehydrated zeolites NaA, NaY, and barium-exchanged NaY luminesce when irradiated with the 1064 nm laser light of an FT-Raman instrument. When hydrogen is adsorbed in the zeolite, the luminescence is altered in several ways. Most remarkable is the appearance of "absorptions" in the positions of the first vibrational overtones of H(2) and HD. Although these features are in the expected positions with reasonable band profiles for overtone absorptions, the large extinction of the luminescent intensity requires a more efficient mechanism than simple reabsorption of emitted photons. In addition to the appearance of holes in the luminescence spectrum, other luminescent features are substantially quenched by the presence of hydrogen or, in one case, augmented.
Sweany
Ray L
RL
Department of Chemistry, University of New Orleans, New Orleans, Louisiana 70148, USA. rlscm@uno.edu
Bono
Jason M
JM
Boyd
Kevin J
KJ