@article {ISI:000251450900012,
	title = {Laser induced fluorescence of Mg-phthalocyanine in He droplets: Evidence for fluxionality of large H(2) clusters at 0.38 K},
	journal = {JOURNAL OF CHEMICAL PHYSICS},
	volume = {127},
	number = {21},
	year = {2007},
	month = {DEC 7},
	pages = {214301},
	abstract = {The formation of Ar and H(2) clusters, having up to 900 particles in helium droplets, has been studied via laser induced fluorescence of attached Mg-phthalocyanine (Mg-Pc) molecules. In the experiments, one Mg-Pc molecule in average was added to each He droplet either before or after the cluster species, and the shift of the spectrum of the Mg-Pc molecules was studied as a function of the cluster size. For Ar clusters, about a factor of 2 smaller matrix shift was observed for the late pickup of the Mg-Pc molecules as compared with the prior pickup, indicating that in the former case, the Mg-Pc molecules reside on the surface of the preformed Ar clusters. On the other hand, the spectra of the Mg-Pc molecules attached to H(2) clusters are independent of the pickup order, which is consistent with Mg-Pc molecules residing near the center of the H(2) clusters in both cases. Therefore H(2) clusters remain fluxional in helium droplets at T=0.38 K. No significant differences in the spectra were observed between the para-H(2) and ortho-H(2) clusters.},
	issn = {0021-9606},
	doi = {10.1063/1.2802303},
	author = {Kuma, Susumu and Goto, Haruka and Slipchenko, Mikhail N. and Vilesov, Andrey F. and Khramov, Alexander and Momose, Takamasa}
}
