A microwave-optical double-resonance study of gas-phase yttrium monoxide
作者:Timothy C. Steimle、Yahya Al-Ramadin
DOI:10.1016/0009-2614(86)80429-8
日期:——
Microwave-opticaldouble-resonance signals for the N = 1→2 and N = 3→4 transitions of gas-phaseyttriummonoxide in its ground electronic state have been recorded. A comparison with the simulated spectrum produced using the spectroscopic parameters derived from a recent analysis of the sub-Doppler optical spectrum is made.
Kinetic study of gas-phase Y(a 2D3/2) and La(a 2D3/2) with O2, N2O, CO2 and NO
作者:Mark L. Campbell
DOI:10.1016/s0009-2614(98)00905-1
日期:1998.9
The second-order rate constants of gas-phase Y(a(2)D(3/2)) and La(a(2)D(3/2)) with O-2, N2O, CO2 and NO as a function of temperature are reported. In all cases, the reactions are relatively fast. For Y(a(2)D(3/2)), the bimolecular rate constants (in cm(3) s(-1)) are described in Arrhenius form by k(O-2) = (2.2 +/- 0.1) X 10(-10) exp(-3.5 +/- 0.6 kJ mol(-1)/RT), k(N2O) = (1.9 +/- 0.2) X 10(-10) exp( -4.0 +/- 0.8 kJ mol(-1)/RT), k(CO2) = (1.0 +/- 0.1) x 10(-10) exp(-2.3 +/- 0.6 kJ mol(-1)/RT), where the uncertainties are +/-2 sigma. The rate constants for Y reacting with NO are temperature insensitive with a value of 1.0 X 10(-10) cm(3) s(-1). For La(a(2)D(3/2)), the bimolecular rate constants for all the reactants are near the gas-kinetic collision rate. (C) 1998 Published by Elsevier Science B.V. All rights reserved.
Fine and magnetic hyperfine structure in the <i>A</i> <sup>2</sup>Π and <i>X</i> <sup>2</sup>∑<sup>+</sup> states of yttrium monoxide
作者:W. J. Childs、O. Poulsen、T. C. Steimle
DOI:10.1063/1.454186
日期:1988.1.15
A molecular beam optical and rf–optical double resonance spectroscopic study of numerous vibrational components in the A2Π3/2–X2∑+ subband of gas phase YO has been performed. The fine and magnetic hyperfine parameters for v=0–4 of the X2∑+ state have been determined. The observed strong vibrational dependence of the spin–rotation parameter γ(X2∑+) is proposed to arise from a perturbation from two as yet unobserved low-lying 2Π states coming from a three open-shell configuration. The magnetic hyperfine parameters for the X2∑+ state can be interpreted in terms of a single unpaired electron model. An estimate for the A2Π excited state dipolar parameter has been established.
Rydberg and pulsed field ionization-zero electron kinetic energy spectra of YO
作者:Colan Linton、Benoit Simard、Hans Peter Loock、Sara Wallin、Gretchen K. Rothschopf、Robert F. Gunion、Michael D. Morse、Peter B. Armentrout
DOI:10.1063/1.479759
日期:1999.9.15
A spectroscopic study of the Rydberg states of YO accessed from particular rotational levels of the A 2Π1/2, v=0 state has been combined with a pulsed field ionization, zero electron kinetic energy (PFI-ZEKE) investigation. The results provide accurate values of the ionization energy of YO, ionization energy I.E.(YO)=49 304.316(31) cm−1 [6.112 958(4) eV], and of the rotational constant (and bond length) of the YO+ cation in its X 1Σ+, v=0 ground state, B0+=0.4078(3) cm−1 [r0=1.7463(6) Å]. The improved value of I.E.(YO) combined with the known ionization energy of atomic yttrium then leads to the result D00(Y−O)−D00(Y−O)=0.1041±0.0001 eV. Combining this result with the value of D00(Y+−O) obtained from guided ion beam mass spectrometry yields an improved value of D00(Y−O)=7.14±0.18 eV. The PFI-ZEKE spectra display an interesting channel-coupling effect so that all rotational levels with J+⩽J′(A)+0.5 are observed with high intensity, where J+ is the angular momentum of the YO+ cation that is produced and J′(A) is the angular momentum of the A 2Π1/2 state that is reached when the first photon is absorbed. This is thought to result from the interaction between the dipole moment of the rotating YO+ core and the Rydberg electron, which can induce changes in l and J+ subject to the dipolar coupling matrix element selection rule, ΔJ+=±1, Δl=±1. The channel-coupling mechanism also appears to induce an inverse autoionization process in which an unbound electron with a low value of l is captured either by its low-J+ YO+ cation or by a second YO+ cation with the same value of J+. This inverse autoionization process is extremely sensitive to the electron kinetic energy, leading to narrow peaks in the PFI-ZEKE spectrum which are only slightly broader than the laser linewidth employed for this study (0.25 cm−1).