Further spectroscopic investigations of the high energy electronic states of SrOH: The (B)over-tilde '(2)Sigma(+)(000)-(A)over-tilde(2)Pi(000) and the (D)over-tilde(2)Sigma(+)(000)-(A)over-tilde(2)Pi(000) transitions

TY - JOUR

T1 - Further spectroscopic investigations of the high energy electronic states of SrOH: The (B)over-tilde '(2)Sigma(+)(000)-(A)over-tilde(2)Pi(000) and the (D)over-tilde(2)Sigma(+)(000)-(A)over-tilde(2)Pi(000) transitions

AU - Wang, J.-G.

AU - Dick, M. J.

AU - Sheridan, P. M.

AU - Yu, S.

AU - Bernath, P. F.

PY - 2007/9

Y1 - 2007/9

N2 - The (B) over tilde ('2)Sigma(+) and (D) over tilde (2)Sigma(+) states of SrOH were investigated using optical-optical double-resonance (OODR) spectroscopy. Rotational and fine structure parameters have been determined for these two states through a combined least-squares fit of the current OODR data along with the OODR data of the (C) over tilde (2)pi-(A) over tilde (2)pi transition, the optical data of the (A) over tilde (2)pi-(X) over tilde (2)Sigma(+) transition and the millimeter-wave pure rotational measurements of the (X) over tilde (2)Sigma(+) state. The spin-rotation constant, gamma, of the (B) over tilde'Sigma(+) state was found to be 0.002653 cm(-1), which is two orders of magnitude smaller than that of the (B) over tilde (2)Sigma(+) state (-0.1447 cm(-1)). This small T value suggests that this state arises from a Sr+ atomic orbital of mainly 6s sigma character. This atomic orbital assignment is also supported by the large rotational constant observed in the (B) over tilde'(2)Sigma(+) state and the similarity of the molecular constants to those of the (D) over bar (2)Sigma(+) state of CaOH. The rotational energy levels of the (D) over tilde (2)Sigma(+)state of SrOH were found to be largely perturbed, which prohibited the accurate determination of the spin-rotation constant in this state. This perturbation is most likely due to an interaction with a (2)Sigma vibronic component of the nearby (C) over tilde (2)pi state. (c) 2007 Elsevier Inc. All rights reserved.

AB - The (B) over tilde ('2)Sigma(+) and (D) over tilde (2)Sigma(+) states of SrOH were investigated using optical-optical double-resonance (OODR) spectroscopy. Rotational and fine structure parameters have been determined for these two states through a combined least-squares fit of the current OODR data along with the OODR data of the (C) over tilde (2)pi-(A) over tilde (2)pi transition, the optical data of the (A) over tilde (2)pi-(X) over tilde (2)Sigma(+) transition and the millimeter-wave pure rotational measurements of the (X) over tilde (2)Sigma(+) state. The spin-rotation constant, gamma, of the (B) over tilde'Sigma(+) state was found to be 0.002653 cm(-1), which is two orders of magnitude smaller than that of the (B) over tilde (2)Sigma(+) state (-0.1447 cm(-1)). This small T value suggests that this state arises from a Sr+ atomic orbital of mainly 6s sigma character. This atomic orbital assignment is also supported by the large rotational constant observed in the (B) over tilde'(2)Sigma(+) state and the similarity of the molecular constants to those of the (D) over bar (2)Sigma(+) state of CaOH. The rotational energy levels of the (D) over tilde (2)Sigma(+)state of SrOH were found to be largely perturbed, which prohibited the accurate determination of the spin-rotation constant in this state. This perturbation is most likely due to an interaction with a (2)Sigma vibronic component of the nearby (C) over tilde (2)pi state. (c) 2007 Elsevier Inc. All rights reserved.

KW - SrOH

KW - optical-optical double-resonance

KW - alkaline-earth containing molecules

KW - DOUBLE-RESONANCE SPECTROSCOPY

KW - LASER SPECTROSCOPY

KW - LYING STATES

KW - MOLECULES

KW - CAOH

KW - EXCITATION

KW - SYSTEM

U2 - 10.1016/j.jms.2007.06.005

DO - 10.1016/j.jms.2007.06.005

M3 - Article

VL - 245

SP - 26

EP - 33

JO - JOURNAL OF MOLECULAR SPECTROSCOPY

JF - JOURNAL OF MOLECULAR SPECTROSCOPY

SN - 0022-2852

IS - 1

ER -