Browsing Abstracts of OSU International Symposium on Molecular Spectroscopy 1990-1999 by Title
Now showing results 1778-1797 of 3912
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LABORATORY AND ASTRONOMICAL DETECTION OF RHOMBOIDAL $SiC_{3}$
Apponi, A. J.; McCarthy, M. C.; Gottlieb, C. A.; Thaddeus, P. ( 1999 )The rotational spectrum of rhomboidal $SiC_{3}$ in its $^{1}A_{1}$ electronic ground state was measured in a laboratory discharge of silane and acetylene by Fourier transform microwave spectroscopy and direct absorption ... -
LABORATORY DETECTION OF THE CARBON CHAINS $HC_{15}N AND HC_{17}N$
McCarthy, M. C.; Grabow, Jens-Uwe; Travers, Michael J.; Chen, Wei; Gottlieb, C. A.; Thaddeus, P. ( 1998 )The linear cyanopolyynes $HC_{15}N$ and $HC_{17}N$ were detected in the laboratory by Fourier-transform microwave spectroscopy. Enough rotational lines of each species were measured in the 5-11 GHz frequency range so that ... -
LABORATORY DETECTION OF THE NEW CARBON CHAIN RADICAL $H_{2}CCCCN$
Chen, Wei; McCarthy, M. C.; Travers, Michael J.; Thaddeus, P.; Gottlieb, Elaine W.; Gottlieb, C. A.; Munrow, Michaeleen R.; Novick, Stewart E. ( 1997 )The cyanomethyl radical, $H_{2} CCN$, was first found in the interstellar medium and then detected in the laboratory in 1988, however, the longer members of this sequence have remained undetected. We report the first ... -
LABORATORY DETECTION OF THE RING-CHAIN MOLECULE $C_{5}H_{2}$
Travers, Michael J.; McCarthy, M. C.; Gottlieb, C. A.; Thaddeus, P. ( 1997 )The highly polar ring-chain ethynylcyclopropenylidene, $C_{5}H_{2}$ [i.e., $c-C_{3}H(CCH)$], a carbene with a singlet electronic ground state, has been detected with a Fourier transform molecular beam microwave spectrometer ... -
LABORATORY EVIDENCE FOR THE NATURE OF THE CARRIERS OF SOME DIFFUSE INTERSTELLAR BANDS
Maier, John P. ( 1994 )Electronic absorption spectra of highly unsaturated hydrocarbons embedded in 5 K neon matrices suggest that these species may be the carriers of some of the known diffuse interstellar bands. The laboratory data have been ... -
LABORATORY MEASUREMENTS OF IR MOLECULAR ION ABSORPTION INTENSITIES
Coe, James V. ( 1992 )Primarily due to infrared laser spectroscopic techniques a fairly extensive data set including frequency measurements, band origins, and structures now exists for over 60 molecular ions. However, there is only very limited ... -
LABORATORY SPECTROSCOPY OF THE $C_{7}H$ AND $C_{2}H$ RADICALS
McCarthy, M. C.; Travers, Michael J.; Thaddeus, P. ( 1996 )The linear carbon chain radicals $C_{7}H$ and $C_{8}H$ have been detected in their $^{2}H$ electronic ground states in an acetylene/argon discharge. For each radical, both spin-orbit components have been detected, precise ... -
LAMBDA-DOUBLET PROPENSITIES OF NO $(X^{2}\Pi)$ IN ROTATIONALLY INELASTIC SCATTERING BY Ar AT 212 meV
Lin, Ao; Antonova, Stiliana; Tsakotellis, Antonis P.; McBane, George C. ( 1998 )A rotationally inelastic scattering experiment of NO with Ar was done at a (Center Of Mass) collision energy of 212 meV. NO $(X^{2}\Pi)$ was prepared in its lowest rotational and spin-orbit state by supersonic expansion ... -
LARGE AMPLITUDE MOTIONS IN THE WATER MOLECULE
Sage, Martin L. ( 1993 )Large amplitude vibrations in isolated water molecules are discussed using van Vleck perturbation theory. An effective hamiltonian is developed for each nearly degenerate manifold of stretching and bending states. -
Large Amplitude Motions of Molecules and Ions Revealed by Supersonic Jet Spectroscopy
Ito, Mitsuo ( 1994 )Several laser electronic spectroscopies are applied for the study of large amplitude motions of aromatic molecules and ions in supersonic jets. The internal rotation of the $CH_{3}$ group in substituted toluenes in ground, ... -
LARGE INTERSTELLAR MOLECULES: ARE THEY FORMED BY GAS PHASE CHEMISTRY,GRAIN SURFACE CHEMISTRY, OR BOTH?
Snyder, L. E. ( 1999 )Large interstellar molecules with a low degree of saturation can be formed by gas-phase $chemistry^{a}$. However, large molecules with a high degree of saturation cannot be formed easily by gas-phase reactions; consequently, ... -
LARGE PENETRATION DEPTH OFF ATOMS COMBINED WITH ACCUMULATION AND DETECTION IN RARE GAS INTERFACES
Schwentner, N.; Bressler, C. G.; Dickgiesser, M. ( 1997 )The penetration of photomobilized F atoms is studied by a sandwich experiment using a stack of three rare gas layers. In the top layer photomobile F atoms are prepared, the spacer layer of variable thickness serves as a ... -
LARGE-AMPLITUDE BENDING DYNAMICS OF ACETYLENE
Jacobson, Matthew P.; O'Brien, Jonathan P.; Silbey, R. J.; Field, R. W. ( 1998 )We have investigated and the large-amplitude bending dynamics of acetylene, in its ground electronic state, using an effective Hamiltonian model that reproduces all relevant experimental data (84 vibrational levels), up ... -
LASER ABSORPTION AND EMISSION SPECTROSCOPY OF THE YELLOW GREEN BAND SYSTEM OF $TiCl^{+}$
Kaledin, L. A.; Heaven, M. C. ( 1997 )The Yellow-Green band system of $TiCl^{+}$ has been studied using a dual-beam laser absorption technique in a hollow cathode $discharge^{m}$, and conventional emission spectroscopy. The quartz discharge cell for emission ... -
Laser Absorption Spectroscopy of $LaF^{+}$: Accurate Term Energies for the $H^{2}\Pi$, $D^{2}\Phi$, and $X^{2}\Delta$ States
Kalden, L. A.; Kaledin, A. L.; Heaven, M. C. ( 1996 )The laser absorption spectrum of the $LaF^{+}$ molecular ion has been observed for the first time. Gas phase LaF was obtained by heating a mixture of a 0.2 g of La metal and 0.3 g of $LaF_{3}$ powder to 1900 K. $LaF^{+}$ ... -
LASER ABSORPTION SPECTROSCOPY OF $TiCl^{+}$ : ANALYSIS OF THE [17.9]$^{3}\Delta-X^{3}\Phi(0, 0)$ Band
Kaledin, L. A.; Parrish, J. P.; Heaven, M. C. ( 1996 )The laser absorption spectrum of the $TiCl^{+}$ molecular ion was observed for the first time in a hollow cathode discharge. The discharge was driven at 25 KHz at powers in the range of 80- 100 W. Peak currents of 0.5 A ... -
LASER ABSORPTION SPECTROSCOPY OF HYDROCARBON FLAMES
Cheskis, Sergey; Derzy, Igor; Lozovsky, Vladimir A. ( 1999 )Intracavity Laser Absorption Spectroscopy (ICLAS) and Cavity Ring-Down Spectroscopy (CRDS) were used to detect absorption spectra of $CH(C^{2}\Sigma^{-}\leftarrow X^{2}\Pi)$ at 314 nm, $^{1}CH_{2} (\bar{b}^{1}B_{1}\leftarrow ... -
LASER ABSORPTION SPECTROSCOPY OF LaF: ANALYSIS OF THE $B^{1}\Sigma^{+}$ TRANSITION
Kaledin, L. A.; Kaledin, A. L.; Heaven, M. C. ( 1996 )Laser absorption spectrum of the LaF $B^{1}\Pi-X^{1}\Sigma^{+}$ (2,0), (1,0), (2,1), and (3,2) bands was recorded. Gas phase LaF was obtained by heating a mixture of a 0.2 g of La metal and 0.3 g of $laF_{3}$ powder to ... -
LASER AND FOURIER TRANSFORM EMISSION SPECTROSCOPY OF THE $G^{4}\Phi -X^{4}\Phi$ SYSTEM OF TITANIUM MONOFLUORIDE.
Ram, R. S.; Peers, J. R. D.; Teng, Ying; Adam, A. G.; Muntianu, Alexandrina; Bernath, P. F.; Davis, S. P. ( 1997 )The emission spectrum of the $G^{4}\Phi - X^{4}\Phi$ transition of TiF has been observed in the $13500 - 16000\;cm^{-1}$ region using a Fourier transform spectrometer (FTS), as well as by laser excitation spectroscopy. In ... -
LASER DIODE SPECTROSCOPY OF ACETYLENE IN THE $12700 CM^{-1}$ REGION
Li, D.; Baker, J. G.; Bowring, N. J. ( 1993 )Spectra with linewidths of $0.04 cm^{-1}$ are presented for the $\nu_{1}+3\nu_{3}(a)$ and $\nu_{1}+2\nu_{2}+\nu_{3}+4\nu_{4}^{0}(b)$ bands of acetylene in the $12680 -12725 cm^{-1}$ range. These were obtained with inexpensive ...