With time-resolved (picosecond) infrared holeburning spectroscopy, we directly demonstrate the inhomogeneity of acid sites in zeolites. Remarkably, the degree of relative inhomogeneity decreases upon adsorption of weakly interacting molecules.

Elsevier B.V.
H. Chon , S.-K. Ihm , Y.S. Uh
Ultrafast Spectroscopy

Bonn, M., Brugmans, M. J. P., Bakker, H., Kleyn, A. W., & van Santen, R. A. (1997). Infrared holeburning spectroscopy in acid zeolites. In H. Chon, S.-K. Ihm, & Y. S. Uh (Eds.), Progress in Zeolite and Microporous Materials; part A : Proceedings of the 11th International Zeolite Conference, Seoul, Korea, August 12-17, 1996 (pp. 567–574).