Investigation of new systems for potential laser action Quarterly status report, 1 Dec. 1968 - 28 Feb. 1969

Electronic absorption spectra of mercuric iodid

Investigation of new systems for potential laser action Quarterly report, 1 Jun. - 30 Sep. 1969

Metal halides as new chemical system for laser actio

VACUUM ULTRAVIOLET ABSORPTION SPECTRUM OF DICYANOACETYLENE

$^{1}$C. Baker and D. W. Turner, Proc. Roy. Soc. A308, 19 (1968).""Author Institution: Department of Chemistry, Northeastern UniversityThe gas phase absorption spectrum of $C_{4} N_{2}$ has been measured photoelectrically from 2000 ${\AA}$ to 1050 ${\AA}$ with a 1-m monochromator having a 1.0 ${\AA}$ bandwidth. The region from 1650--1050 ${\AA}$ is dominated by a $ns\leftarrow \pi$ Rydberg series converging to the first ionization potential at 11.81 eV. Vibrational structure on the short-wavelength side of the Rydberg bands consists of several well-resolved peaks, with an average spacing of $2120 cm^{-1}$. This is probably due to excitation of the symmetric $C\equiv N$ stretching mode $\nu_{1}$ and is very similar to the vibrational structure in the photoelectron spectrum obtained by Baker and $Turner.^{1}$. A non-Rydberg band at 1720 ${\AA}$ has an oscillator strength of 0.03. The assignment of this band will be discussed with the aid of a simple INDO molecular orbital calculation

THE ELECTRONIC ABSORPTION SPECTRUM OF METHYL AMINE AND ITS DEUTERIUM DERIVATIVES

Author Institution: Department of Chemistry, Northeastern UniversityThe absorption spectra of methyl amine, methyl amine-$d_{2}$, methyl-$d_{3}$ amine and methyl-$d_{3}$ amine-$d_{2}$ have been measured photoelectrically in the 1050-2500 {\AA} region with a 1-m monochromator having a $1.0 {\AA}$ band-width. Only the first two electronic transitions at 2150 and $1740 {\AA}$ show extensive vibrational structure. The deuterium derivatives have aided in the vibrational analysis of the previously unassigned $1740 {\AA}$ band. The electronic structure of methyl amine will be discussed in relation to that of ammonia and other simple alkyl amines

VACUUM--ULTRAVIOLET SPECTRA OF THE MERCURIC HALIDES

Author Institution: Department of Chemistry, Northeastern UniversityThe gas phase absorption spectra of mercuric chloride, mercuric bromide and mercuric iodide have been measured with photoelectric detection in the region 2300 {\AA} to 1050 {\AA}, using a 1 meter monochromator of 1.0 {\AA} band width. Several new bands were observed below 1600 {\AA} in all three compounds, as well as additional structure in some of the bands above 1600 {\AA}. Mercuric iodide vapor showed new structure on the long-wavelength side of the 2240 {\AA} band and new bands in the 1600 {\AA}. 1280 {\AA} and 1200 {\AA} regions. Further, a highly structured band begins at 1160 {\AA} and extends below 1070 {\AA}. For the bromide, new bands are reported in the 1540 {\AA}, 1450 {\AA}, 1390 {\AA} and 1130 {\AA} regions, and for the chloride in the 1500 {\AA} to 1430 {\AA} region as well as at 1075 {\AA}. The experimental results will be correlated with Extended Huckel-Type molecular orbital calculations