@article {511,
	title = {Rotational analysis of the (A)over-tilde(2)A(1)-(X)over-tilde(2)A(1) band system of yttrium dicarbide,YC2},
	journal = {Journal of Molecular Spectroscopy},
	volume = {215},
	number = {1},
	year = {2002},
	note = {ISI Document Delivery No.: 601LETimes Cited: 5Cited Reference Count: 40},
	month = {Sep},
	pages = {10-28},
	type = {Article},
	abstract = {{The 000-000 and 3(0)(1) bands of the 775-nm electronic transition of YC2 (A(2)A(1) <{\textendash}X-2 A(1)) have been studied at high resolution, using the laser-induced fluorescence from a supersonic jet expansion. Three types of experiment have been carried out. First, the complete rotational and hyperfine structures of the two bands were recorded. To Measure the small asymmetry splittings in the K = 2 levels of the X(2)A(1), state, portions of the b-type 3(0)(1) and were then recorded in the presence of a weak static electric field. Finally, a number of pure rotational transitions between the K = 0 levels of the ground state were recorded by pump/probe microwave optical double resonance. A few small rotational perturbations occur in the upper electronic state but omitting the perturbed lines, the combined data sets could be modeled using an effective Hamiltonian operator appropriate for the rotation, electron spin, and hyperfine structure of a rigid asymmetric top molecule, The molecule is confirmed as being "T-shaped." where the Y atom is bonded to the side of a C-2 group: the rotational Constants determined are for the A(2)A(1), 3(1) level},
	keywords = {ACTIVATION, C-H BOND, DOUBLE-RESONANCE, ELECTRONIC-STRUCTURE, HYPERFINE-STRUCTURE, MICROWAVE, MONOSULFIDE, SPECTROSCOPY, SPIN-ROTATION, TRANSITION-METAL ATOMS, YC2},
	isbn = {0022-2852},
	url = {<Go to ISI>://000178446800002},
	author = {Steimle, T. C. and Bousquet, R. R. and Namiki, K. C. and Merer, A. J.}
}
@article {4138,
	title = {Optical detection of yttrium dicarbide, a {\textquoteright}{\textquoteright}T-shaped{\textquoteright}{\textquoteright} molecule},
	journal = {Journal of Chemical Physics},
	volume = {106},
	number = {6},
	year = {1997},
	note = {ISI Document Delivery No.: WG307Times Cited: 13Cited Reference Count: 28},
	month = {Feb},
	pages = {2060-2066},
	type = {Article},
	abstract = {The yttrium dicarbide molecule, YC2, has been identified in the reactions of laser-ablated yttrium with methane and other small hydrocarbons under supersonic jet-cooled expansion conditions. A parallel-polarized electronic band system with origin at 12889.5 cm(-1) has been tentatively identified as an A(1)-<(X)over tilde (2)A(1)> transition of a {\textquoteright}{\textquoteright}T-shaped{\textquoteright}{\textquoteright} isomer where the Y atom is bonded to the side of a C-2 molecule. Weak vibronically induced perpendicular bands, representing Delta upsilon(3)=odd transitions, are also present. Extensive vibrational progressions in the excitation and the resolved fluorescence spectra have been analyzed to give the two lowest vibrational frequencies of the two electronic states: (X) over tilde (2)A(1), nu(2) (a(1))=561.1(+/-2.8 cm(-1)), nu(3) (b(2))=369.6 (+/-1.7 cm(-1)); excited A(1), nu(2)=494.5(+/-5.0 cm(-1)), nu(3)=331.6(+/-2.2 cm(-1)). No bands involving the C-C stretching vibration (nu(1),a(1)) have been found. The frequency of the vibration in the ground state indicates that the barrier to internal rotation of the C-2 group against the Y atom is quite high, but large anharmonic coupling between the nu(2) and nu(3) vibrations suggests that internal rotation is facilitated by excitation of the Y-C-2 stretohing vibration. (C) 1997 American lnstitute of Physics.},
	keywords = {ACTIVATION, C-C BONDS, CLUSTERS, HYDROCARBONS, JET-COOLED SIC2, SPECTROSCOPY, TRANSITION-METAL ATOMS, YC2},
	isbn = {0021-9606},
	url = {<Go to ISI>://A1997WG30700002},
	author = {Steimle, T. C. and Marr, A. J. and Xin, J. and Merer, A. J. and Athanassenas, K. and Gillet, D.}
}
