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

Rotational analysis of (6,20), (4,20), and (2,18) bands in the second negative (A2Πu–X2Πg) system of cation

“…The signal-to-noise ratio (S/N) for these lines was typically 10, half that of the previous S/N from Ref. [1]. One hundred and twenty one spectral lines in the 12 800-13 200 cm À1 region were assigned to the (2, 18) band by virtue of the precise constants obtained from Ref.…”

“…In our previous work, studies on the O þ 2 ion were presented and three bands with v 00 = 18, 19 in the second negative (A 2 P u -X 2 P g ) system of O þ 2 in the 12 100-14 100 cm À1 near infrared region were investigated by employing optical heterodyne magnetic rotation enhanced velocity modulation spectroscopy (OH-MR-VMS) [1]. In this note, three more new bands, namely (6,20), (4,20), and (2, 18) bands, were analyzed after further study of the residual spectral lines, therefore, precise constants for the level v 00 = 20 were determined for the first time.…”

“…One hundred and twenty one spectral lines in the 12 800-13 200 cm À1 region were assigned to the (2, 18) band by virtue of the precise constants obtained from Ref. [1]. Because the laser could not be tuned successively in the 13 050-13 160 cm À1 region, only part of the spectral lines in this region were obtained.…”

“…To obtain accurate parameters, besides the three new bands, three bands in the Ref. [1] were also included in the present leastsquare fitting, and the weights were given as described in our previous work [1]. Forty-two rotational parameters and 6 band origins were determined by the fit.…”

New rovibrational analysis of A–X absorption spectrum of

“…Then we adopted the method of Ref. [21] to reset the weights. When |m obs À m cal | < 2r, the weight was given as 1; when 2r < |m obs À m cal | < 2n, where n was the experimental uncertainty of 0.007 cm À1 , the weight was given as 0.1; when 2n < |m obs À m cal | < 3n, the weight was given as 0.01; and when |m obs À m cal | > 3n, the weight was given Table 2 Wavenumbers (in cm À1 ) and rotational lines for the X = 1/2 components of (3, 7) band of 35 as 0.…”