New ÖX̃ vibronic bands of laser-vaporized C3

Abstract

Articles you may be interested inHigh-resolution laser spectroscopy and magnetic effect of the B ̃ 2E′ ← X ̃ 2A2′ transition of 14NO3 radical

Laser excitation spectrum of C3 in the region 26000–30700cm−1

“…The lowest-lying vibrational levels of theà 1 P u state of C 3 have been well documented by previous workers [4,15,16,19,[26][27][28][29]. The 000 level lies at 24 676 cm À1 , and 16 of the 19 excited levels expected below 25 700 cm À1 have been found, the only unobserved levels being 040 H u , 011 D u and 011 R À u .…”

“…It turns out that the progressions identified by other workers [4,15,16,19,[26][27][28][29] at lower energy can be extended fairly straight-forwardly to this high frequency region. There is initially very little stretch-bend anharmonicity, so that the intervals in the various bending progressions are almost independent of the number of stretching quanta excited.…”

“…Rotational constants and vibrational energies have been determined for over 60 previously-unreported vibronic levels; a number of other levels have been re-assigned. The vibrational structure is complicated by interactions between levels of the upper and lower Born-Oppenheimer components of theà 1 P u state, and by the effects of the double minimum potential in the Q 3 coordinate, recognized by Izuha and Yamanouchi [16]. The present work shows that there is also strong anharmonic resonance between the overtones of the m 1 and m 3 vibrations.…”

“…Next, theà 1 P u state has a very large splitting between its two Born-Oppenheimer components, which provides beautiful examples of the effects of orbital angular momentum in a linear polyatomic molecule [4,14]. In addition, the antisymmetric stretching vibration of theà 1 P u state has a double minimum potential function, [15][16][17] while theà 1 P u -X 1 R þ g system (despite its perpendicular polarization) contains a vibronically-induced parallel transition moment [15,16].…”

“…Analysis of theà 1 P u state [4,15,16,19,[25][26][27][28][29][30][31][32] is complicated by the overlapping of many of the bands, the irregularity of the vibrational structure caused by the orbital angular momentum and the presence of rotational perturbations. When the 0 0 0-0 0 0 band of the 4050 Å system was found in spectra of the diffuse interstellar medium, [10] it was noticed [11] that the perturbations had resulted in a mis-assignment of the astrophysically-important R(0) line at 24676.7 cm À1 .…”