Accession Number:

AD0607942

Title:

VIBRATION-ROTATION SPECTRUM OF MATRIX ISOLATED AMMONIA.

Descriptive Note:

Technical rept. no. 3,

Corporate Author:

MICHIGAN UNIV ANN ARBOR COLL OF LITERATURE SCIENCE AND THE ARTS

Personal Author(s):

• MEREDITH,Robert E.

Report Date:

1963-11-01

Pagination or Media Count:

76.0

Abstract:

An investigation of NH3 and ND3 isolated in inert gas matrices at 4.2K was made in the regions of the Nu-1, -2, and -3 fundamentals, and in the vicinity of the overtone 2 Nu-4. The spectra were scanned with spectral slit widths ranging from .1 to .5cm, and it was found that this resolution was adequate to insure that all the observed line widths and shapes were free from instrumental broadening. The Nu-2 fundamental was interpreted in terms of a free rotation model, with the line spacings and inversion splitting having values very close to those observed for gas phase molecules. The interpretation of the Nu-1, Nu-3 and 2 Nu-4 spectra was much more difficult, since these bands were too weak to permit observation of the E type spectra, and since the inversion doubling of the levels involved cannot be observed due to the broadness of the lines. It was possible, however, to determine the dependence of the lines on the ratio of inert gas atoms to ammonia molecules, and to assign the transitions involved as arising from either single isolated molecules or from ammonia complexes caused by incomplete isolation. Argon, krypton, and xenon were successively used as matrices, and spectra obtained in each case differed only in the vibrational frequencies were shifted to longer wavelengths as the matrix was varied. Author

Descriptors:

• *AMMONIA
• *FREE RADICALS
• INFRARED SPECTRA
• EMBEDDING SUBSTANCES
• AMMONIUM COMPOUNDS
• CHEMICAL BONDS
• VIBRATION
• ROTATION
• BAND SPECTRA
• ATOMIC ENERGY LEVELS
• SOLIDIFIED GASES
• ARGON
• KRYPTON
• XENON

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE