Search

The visible electronic transitions of AuCl were observed at high resolution for the first time. The spectrum was recorded with the Fourier transform spectrometer associated with the McMath–Pierce solar telescope at Kitt Peak. The excited AuCl molecules were produced in a microwave discharge, with 4 Torr of helium seeded with 3% chlorine flowing over AuCl3powder. Constants for theX1Σ+,AΩ = 1, andBΩ = 0+states of Au35Cl are presented. TheAΩ = 1 and theBΩ = 0+states may be two spin–orbit components of a3Π electronic state, and molecular parameters for this excited3Π state also are given.

The near-infrared electronic transition of CuS has been observed for the first time. The spectrum of theY2Σ+–X2Π transition, labeled by analogy with the CuO near infrared electronic transition, was recorded with the Fourier transform spectrometer associated with the McMath–Pierce Solar Telescope, Kitt Peak, Arizona. The excited CuS molecules were produced in a King-type carbon tube furnace operating at 1900°C and at a total pressure of approximately 400 Torr. The electronic transition energy and vibrational constants for theY2Σ+state of63Cu32S are presented.

The high-resolution infrared emission spectrum of boron monofluoride was recorded with a Fourier transform spectrometer. There are 359 transitions of 11BF with ν = 1 → 0 to ν = 5 → 4, and 94 transitions of 10BF with ν = 1 → 0 to ν = 3 → 2 assigned. Improved Dunham Yijcoefficients for the ground X1Σ+electronic state were determined from the infrared data combined with existing microwave data. The mass-reduced Dunham Uijcoefficients were also obtained along with Born-Oppenheimer breakdown constants. An effective Born-Oppenheimer potential was determined by fitting the available data to the eigenvalues of the radial Schrödinger equation containing a parameterized potential function. Finally, the relative transition dipole moments of the major isotopomer 11BF were also measured. For AlF, our previous measurements were extended to higher ν and J, in order to obtain improved Dunham coefficients and an improved internuclear potential.

High-resolution Fourier transform spectra of LiH and LiD were recorded in the far-infrared region, 100–360 cm−1, and the mid-infrared regions, 800–1200 cm−1and 2000–3000 cm−1. A total of 261 pure rotational lines and 678 rovibrational lines were measured for the isotopomers6LiH(D) and7LiH(D). Molecular constants for theX1Σ+ground state in the form of mass-dependent DunhamYij's and mass-independent DunhamUij's were determined from a data set of 1476 lines, consisting of our measured line positions and previously reported microwave, millimeter-wave, and infrared lines. An effective internuclear potential for the ground electronic state where the Born–Oppenheimer part is modeled as a parameterized modified-Morse function was also determined from a fit of the data.

High-resolution infrared emission spectra of diatomic indium hydride and deuteride were recorded with a Fourier transform spectrometer. A total of 377 InH lines from the (1, 0) to (5, 4) bands and 257 InD lines from the (1,0) to (4, 3) bands were measured. Revised sets of isotopically dependent Dunham Y constants and isotopically invariant Dunham U constants for the X1Σ+ ground state were determined. In addition, a parametrized internuclear potential for the X1Σ+ state was also obtained from a direct fit of the data to the eigenvalues of the radial Schrödinger equation.Copyright 1995, 1999 Academic Press, Inc.

The infrared emission spectra of NaCl and KCl have been recorded at high resolution with a Fourier transform spectrometer. A total of 929 lines belonging to 8 vibrational bands, 1–0 to 8–7, for Na35Cl, 252 lines of 1–0, 2–1, and 3–2 bands of Na37Cl, and 355 lines of 1–0, 2–1, 3–2, and 4–3 bands of K35Cl have been measured and combined with the existing microwave and millimeter-wave data to obtain a set of refined molecular constants. The data for Na35Cl and Na37Cl have also been fitted to determine the DunhamYijconstants and mass-reduced Dunham constantsUij. In one fit allUij's were treated as adjustable parameters while in a second fit onlyUi0's andUi1's were allowed to vary freely with the remainingUijconstants determined by the constraints imposed by the Dunham model. In addition, the internuclear potential energy parameters were determined by fitting the entire NaCl data set to the eigenvalues of the Schrödinger equation containing a parameterized potential energy function.