Study on the (1, 2) and (2, 3) bands in the comet-tail system of¹²C¹⁶O⁺by optical heterodyne magnetic rotation enhanced velocity modulation spectroscopy

Rovibration spectrum study of three hot bands with ν′′⩾18 in the second negative system (–) of 16O2+ ion

“…The mixture of O 2 gas at 0.3 Torr and He gas at 3.8 Torr flowed continuously through the sample cell under a discharge of 400 mA. The schematic experimental configuration of the OH-MR-VMS has been detailed as described in our previous work [14] and proved to be efficient in the study of several transient species [15][16][17][18][19][20][21][22]. A differential absorption spectrum of I 2 recorded simultaneously was used to calibrate the laser frequency with absolute accuracy better than 0.007 cm À1 .…”

New spectroscopic studies of the Comet–Tail (A2Πi–X2Σ+) system of the CO+ molecule

“…As a result of this calculation (Merging 1) 64 molecular constants characterizing the v 0 = 0-4 and 6-8 vibrational levels of the A 2 P i state and v 00 = 0-2 of the X 2 R + state were determined. Taking into account the fact, that many levels of the X state were earlier investigated in our laboratory in the B-X transition, as well as the A Table 4 Rotational structure constants (in cm À1 ) for the X 2 R + state in the 12 state levels were observed and analyzed during the work on B-A system, aiming at enlargement and completeness of the information about both states of the A-X transition, the following stage of the constants calculation was merge fit (Merging 2) involving present-day investigated bands of A-X system, earlier analyzed 0-3, 1-3, 1-4, 1-5, 2-4, and 2-5 bands of B-X system [30], the 0-0, 0-1, 0-2, 1-0, 1-2, 1-3, and 2-0 bands belonging to B-A system [31] and the 1-2 and 2-3 bands of A-X system, which were observed and analyzed lately by Zhuang et al [23]. However, as a result of the changing resolving power of the spectrograph, from band to band, and the changing c 00 -constant, deciding about the spin structure splitting of band lines of the A-X system and the changing of the difference of the c 0 -c 00 constants for the B-X band system, different ranges of band branches were recorded with a resolved spin structure of lines.…”

“…In 2000, these authors carried out a corrective analysis of 10 bands of the A-X system earlier investigated by them and obtained a new set of constants for the X and A states [22]. In 2001, Zhuang et al [23] recorded the 1-2 and 2-3 bands by means of the optical heterodyne magnetic rotation enhanced velocity modulation spectroscopy method. While the 1-2 band was analyzed on regular basis, the 2-3 band was reinvestigated after the previous analysis by Haridass et al [15].…”

“…Also, the RKR potential curve parameters for A 2 P i state and the r-centroids and the Franck-Condon factors for the A-X transition calculated in the present work are more accurate. It was Zhuang et al [23] who recently obtained these values on the basis of the molecular constants provided by Bembenek et al [31] for the A 2 P i state and by Haridass et al [15] for the X 2 R + state. Bembenek et al [31] investigated the A state only up to v = 3.…”

“…Thus, the RKR potential curve parameters, based on the constants given by the authors, make it possible to perform the precise construction of the A 2 P i state potential curve only around its minimum. Likewise, the Franck-Condon factors and the r-centroids for the A-X transition, determined in 2001 [23] by means of not precise enough constants for both states [15,31], reflect the real intensity of the Comet-Tail system bands with lower precision. Therefore, we believe that the results of the present analysis of the Comet-Tail system of the 12 C 16 O + extend and improve its spectroscopic and quantum information.…”