Abstract
High-resolution quasi-elastic neutron scattering measurements have been performed on molecular hydrogen in zeolite 13X. Previous NMR measurements suggested that the freezing temperature is suppressed from 14 K down to 8 K. In contrast, previous intermediate resolution quasi-elastic neutron scattering studies suggested freezing occurred between 25 and 35 K. Unfortunately, the limited instrumental resolution available in the previous quasi-elastic neutron scattering study was not sufficient to show this point definitively. We report new quasi-elastic neutron scattering measurements with very high resolution that show no evidence of mobile hydrogen below 25 K, which is well above the bulk liquid-solid transition temperature for hydrogen. A quasi-elastic component appears between 25 and 30 K indicating the presence of mobile H2. However, the width and momentum dependence of the quasi-elastic scattering are much different than would be expected for the diffusive motion of liquid hydrogen in this temperature range. Instead, we find that a slow diffusive component representing jumps between well-defined sites appears first at low temperatures. As the temperature is raised, a faster liquid like diffusive component appears.
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REFERENCES
J. Wilks and D. S. Betts, in An Introduction to Liquid Helium, Clarendon Press, Oxford (1987).
M. H. Anderson et al., Science 269, 198 (1995).
V. L. Ginzburg and A. A. Sobyanin, Sov. Phys. JETP Lett. 15, 242 (1972).
H. J. Maris, G. M. Seidel, and T. E. Huber, J. Low Temp. Phys. 51, 471 (1983).
G. M. Seidel, H. J. Maris, F. I. B. Williams, and J. G. Gordon, Phys. Rev. Lett. 56, 2380 (1986).
I. F. Silvera, Rev. Mod. Phys. 52, 393 (1980).
M. Bretz and A. L. Thompson, Phys. Rev. B 24, 467 (1981).
M. Rall, J. P. Brison, and N. S. Sullivan, Phys. Rev. B 44, 9639 (1991).
H. K. Christenson, J. Phys. Cond. Matter 13, R95-R133 (2001).
J. L. Tell and H. J. Maris, Phys. Rev. B 28, 5122 (1983).
R. H. Torii, H. J. Maris, and G. M. Seidel, Phys. Rev. B 41, 7167 (1990).
H. J. Maris, G. M. Seidel, and F. I. B. Williams, Phys. Rev. B 36, 6799 (1987).
N. S. Sullivan, M. Rall, and J. P. Brisson, J. Low Temp. Phys. 98, 383 (1995).
Y. Sonnenblick, E. Alexander, Z. H. Kalman, and I. T. Steinberger, Chem. Phys. Lett. 52, 276 (1977).
M. Fang, Y. Wang, and P. E. Sokol, Phys. Rev. B 50, 12291 (1994).
H. Fu, F. R. Trouw, and P. E. Sokol, J. Low Temp. Phys. 116, 149 (1999).
P. M. Gehring and D. A. Neumann, Physica B 64, 241 (1998).
D. H. Olson, J. Phys. Chem. 74, 2758 (1970).
M. Rall, J. P. Brison, and N. S. Sullivan, Phys. Rev. B 44, 9932 (1991).
C. T. Chudley and R. J. Elliot, Proc. Phys. Soc. 77, (1961).
A. Furrer, in Neutron Scattering from Hydrogen in Materials, World Scientific (1994).
P. A. Egelstaff, in An introduction to the Liquid State, Academic Press (1967).
H. M. Rietveld, Acta Cryst. 22, 151 (1967).
H. M. Rietveld, J. Appl. Cryst. Z, 65 (1969).
J. D. Jorgensen and F. J. Rotella, J. Appl. Crystallogr. 15, 27 (1982).
R. B. VonDreele, J. D. Jorgensen, and C. E. Windsor, J. Appl. Crystallogr. 15, 581 (1982).
M. P. Fang, P. E. Sokol, and Y. Wang, Phys. Rev. B 50; 17, 12291 (1994).
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DeWall, J., Dimeo, R.M. & Sokol, P.E. Slow Diffusion of Molecular Hydrogen in Zeolite 13X. Journal of Low Temperature Physics 129, 171–184 (2002). https://doi.org/10.1023/A:1020896123362
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DOI: https://doi.org/10.1023/A:1020896123362