Abstract

The first known measurement of the refractive index of a clathrate hydrate, the structure II hydrate of tetrahydrofuran, is reported in this paper. The Lorentz–Lorenz equation underestimates the contribution of the guest molecule to the refractivity. Inclusion of the reaction field correction for a molecule in a cavity the size of the cage occupied by the guest molecule gives better agreement. The refractive index predicted for air hydrate, now known to be structure II, is slightly larger than for ice, in agreement with observation of air hydrate trapped in Greenland ice. Hydrate compositions may be determined from refractive indices and from accurate values of the unit cell dimensions.

© 1986 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Refractive-index measurements of natural air–hydrate crystals in an Antarctic ice sheet

T. Uchida, W. Shimada, T. Hondoh, S. Mae, and N. I. Barkov
Appl. Opt. 34(25) 5746-5749 (1995)

Refractive-index measurements in freezing sea-ice and sodium chloride brines

G. A. Maykut and B. Light
Appl. Opt. 34(6) 950-961 (1995)

Skin hydration state estimation using a fiber-optic refractometer

Takashi Takeo and Hajime Hattori
Appl. Opt. 33(19) 4267-4272 (1994)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (1)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Tables (1)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (2)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription