Vibration-Rotation Spectra of 13C-Containing Acetylene: The Stretching Fundamentals

The infrared spectrum of13C2H2in the 60–2600 cm−1region: bending states up tov4 + v5 = 4

“…The weights of the experimental data were chosen proportional to the inverse of their squared estimated uncertainties. An uncertainty similar to the RMS value (3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14); R e-e (4-14) 33 P f-f ; R f-f (2-23) 4 þ 2 5 5 II Å g Å u 1308.04765 …”

“…Predoi-Cross et al (4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19); R f-f ; Q e-f (3-12) 4 þ 2 5 involving states up to v tot ¼ 2 were fitted simultaneously, using as starting parameters the values in Table VI of Ref. [6].…”

“…In addition, the 2 5 , 1 5 and 3 4 difference bands and the 2 þ 5 GS stretchingbending combination band are also observed in various regions of the spectrum. The analysis of all these bands, together with additional stretching-bending combination bands observed at higher wavenumbers, has been reported elsewhere [6][7][8][9][10][11][12][13].…”

“…The infrared spectrum of 13 Apart from early pioneering works [1][2][3][4][5], during the last 20 years the infrared spectrum of 13 C 2 H 2 has been the subject of several investigations [6][7][8][9][10][11][12][13]. In 1993 Di Lonardo et al [6] reported on the bending states of this molecule up to v 4 þ v 5 ¼ 2.…”

“…The quartic anharmonic resonances for the combination levels 1 þ m 4 þ n 5 , 2 þ m 4 þ (n þ 2) 5 and 3 þ (m À 1) 4 þ (n þ 1) 5 were investigated in the region 2000-5200 cm À1 [8]. The stretching fundamentals were further studied and the perturbed and deperturbed G 0 v values for the 1 ¼ 1, 2 ¼ 1 and 3 ¼ 1 states were reported [9]. The Raman spectrum of this molecule was recorded both at medium resolution [10] up to 5300 cm À1 and at high resolution [11,12] up to 4000 cm À1 giving a direct access to the states manifolds of g symmetry.…”