@article {3090,
	title = {ELECTRON-SPIN EXCHANGE-REACTIONS OF MUONIUM ATOMS WITH CHROMIUM(III) COMPLEXES - CONTRASTS WITH POSITRONIUM},
	journal = {Journal of Physical Chemistry},
	volume = {98},
	number = {33},
	year = {1994},
	note = {ISI Document Delivery No.: PC619Times Cited: 7Cited Reference Count: 25},
	month = {Aug},
	pages = {8050-8052},
	type = {Article},
	abstract = {Muonium atoms were observed to undergo a fast reaction with several chromium(III) complexes in water, with rate constants in the neighborhood of 10(10) M(-1) s(-1). The reaction occurring is attributed to a simple electron-spin-exchange in muonium, catalyzed by the paramagnetic d(3) metal ions. There is a quantum mechanical statistical factor for this process of 62\% per collision, which becomes 50\% when multicollisional cage effects in solution are included, with the result that the observed rates are close to the diffusion-controlled limit for a muonium reaction in water. The implication is that nearly half of the encounters between muonium and a Cr complex result in electron spin exchange. These muonium rates are faster by a factor of similar to 5 than the corresponding reactions of positronium. They also show a different dependence on the nature of the ligands. These differences are attributed to positronium being larger and more polarizable than muonium, so that spin-spin coupling with the metal{\textquoteright}s d electrons is weaker and more sensitive to the nephelauxetic effect of the ligands in the case of positronium. The corresponding reactions involving ordinary H atoms are not available for comparison but presumably resemble muonium{\textquoteright}s.},
	keywords = {radicals, RADIOLYSIS, relaxation},
	isbn = {0022-3654},
	url = {<Go to ISI>://A1994PC61900022},
	author = {Lazzarini, E. and Stadlbauer, J. M. and Venkateswaran, K. and Gillis, H. A. and Porter, G. B. and Walker, D. C.}
}
