Saturated absorption spectroscopy near 1.57 μm and revised rotational line list of 12C16O

Line positions, intensities, and Einstein A coefficients for 3–0 band of 12C16O: A spectroscopy learning method*

“…In the present article, the spectroscopy learning method has been applied to the R-branch of 3-0 band in the ground of 12 C 16 O, where excellent examples of line positions are collected by Mondelain et al [8] and Wang et al [11] Moreover, the former frequencies are quoted in HITRAN2016 [26] and latter ones will be updated in HITRAN2020 [19] soon. Here, it is possible to test the spectroscopy learning method directly on the Wang et al line lists (W21) [11] and the labelled line intensities and the Einstein A coefficients from HITRAN2020. [19] Table 1.…”

“…In the spectroscopy learning method, the greedy algorithm motivates us to reach the "true" lines {v true n }, which are tabulated in Table 1, for optimal spectroscopic constants χ(i). And, the determined spectroscopic constants are summarized in Table 2, where the ones learned in the spectroscopy learning method are compared with experimental [8,11,27] and theoretical values [13,14] from literature. The comparison shows an acceptable agreement which can allow us to calculate the line positions with the present spectroscopic constants.…”

“…Of course, one can check these line positions using molecular spectroscopy program (such as PGOPHER [28] ) with spectroscopic constants listed in Table 2. In this work, some line lists are introduced for comparison, such as Mondelain et al line list (M15), [8] Farrenq and Guelachvili's line list (FG91), [3] W21 line list, [11] V12 line list, [13] CH04 line list, [14] Li's line list (Li15). [15] Indeed, we can also make effort to reproduce the transition frequencies of P branch.…”

“…[1,2] The vibrational-rotational transition focusing on the 3-0 band in the ground state of 12 C 16 O has been the subject of numerous experimental and theoretical investigations due to its relatively weak intensity. [3][4][5][6][7][8][9][10][11][12][13][14][15][16] For example, the ATMOS Fourier transform spectrometer has been used to record accurate transition lines of vibrational-rotational bands, from which the Dunham coefficients have been generated for 12 C 16 O. [3] Later, the strongest transitions of the 3-0 band were measured by using Fourier transform spectrometer (FTS) with lines from P17 to R17, [4,5] external cavity diode laser (ECL) with lines from R0 to R20, [6] FTS and a multi-line-fitting technique from P25 to R25.…”

“…Recently, the spectral sensitivity of the comb-locked cavity ring-down spectrometer established by Wang et al allowed the detection of lines with an accuracy of tens of kHz. [11] It should be noted that comprehensive theoretical investigations have been performed for various line lists, such as Goorvitch's line list (G94), [12] Velichko et al (2012) line list (V12), [13] Coxon and Hajigeorgiou's line list (CH04) derived from an empirical potential function, [14] and Li et al line list. [15] These scientific tasks and high-quality spectral data are helpful for understanding the observational astronomy better, description of model-building, constructing dipole moment function, [16,17] and proposing data analysis techniques.…”