Abstract

A double-beam infrared spectrophotometer has been modified so that spectra of films as thin as one or a few monolayers in thickness on metal mirrors can be obtained. It is theoretically predicted and experimentally confirmed that, at the mirror surface, the electric intensity is predominantly perpendicular to the surface. Vibrational modes for which the matrix element of dipole moment is parallel to the surface appear abnormally weak in the spectra. The spectra, therefore, provide information about the orientation as well as the composition of sample films. Spectra of Blodgett films of metal stearates show differences in band positions and band intensities between films one molecular layer in thickness and thicker films. The shifts in band positions are attributed to interactions between carboxylate ions in films thicker than a molecular layer and the absence of such interactions in the first layer. The intensity differences are not explained.

© 1959 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Some Observations on the Use of Elliptically Polarized Light to Study Metal Surfaces*

Frederick P. Mertens, Paul Theroux, and Robert C. Plumb
J. Opt. Soc. Am. 53(7) 788-796 (1963)

Shaping light spectra and field profiles in metal-coated monolayers of etched microspheres

Cristian Alexandru Tira, Isabelle Ly, Renaud A. L. Vallee, Simion Astilean, and Cosmin Farcau
Opt. Mater. Express 7(8) 2847-2859 (2017)

Real-time determination of molecular orientation in Langmuir–Blodgett monolayers on integrated-optical structures

K. D. Hughes, M. J. LaBuda, and P. W. Bohn
Appl. Opt. 30(30) 4406-4411 (1991)

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 (9)

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 (2)

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 (22)

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