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1.
《Journal of Molecular Spectroscopy》1987,125(2):251-257
The Ångström (B1Σ+-A1Π) band system of the 14C18O molecule has been excited and photographed. The derived vibrational and rotational constants (in cm−1) are: 相似文献
2.
3.
《Journal of Molecular Spectroscopy》1987,122(2):417-427
A new method of producing strong and clean emission spectra of the gallium hydride/deuteride molecule has been developed. Five bands belonging to the gallium deuteride molecule (GaD) have been photographed under high resolution. The rotational analyses of the bands lying at 5669.14 Å (0-0) and 5675.10 Å (1-1) in the a3Π1-X1Σ+ transition, 5761.0 Å (0-0) and 5766.20 Å (1-1) in the a3Π0+-X1Σ+ transition, and 5760.85 Å (0-0) in the a3Π0−-X1Σ+ transition have been performed. Accurate rotational constants (B, D) have been determined for the X1Σ+, a3Π0± and a3Π1± states. The Λ doubling in the a3Π0 (v = 0) and a3Π1 (v = 0 and 1) states are obtained. 相似文献
4.
ABSTRACT High-resolution emission spectrum of the 1–4 band of the B 2Σ+–X 2Σ+ transition of 14C16O+ was observed for the first time by conventional emission spectroscopy. The band spectrum was excited in a water-cooled Geissler lamp filled with commercial gaseous carbon monoxide enriched in about 80% of the radiocarbon 14C. A rotational analysis has been carried out and obtained molecular constants have been merged with previously published data for the B 2Σ+–A 2Πi and A 2Πi–X 2Σ+ transitions. The principal equilibrium constants for the ground X 2Σ+ state obtained from this work are ωe = 2121.7726(98), ωe x e = 13.9055(27), B e = 1.815290(30), αe = 1.6594(33) × 10?2, and γe = ? 0.377(73) × 10?4 cm?1. Also, presently known experimental equilibrium molecular constants of the X 2Σ+ states of the CO+ isotopic molecules are summarized and isotopic dependence of the B e and ω e constants is discussed. 相似文献
5.
R. Hakalla R. Kępa W. Szajna M. Zachwieja 《The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics》2006,38(3):481-488
Three bands of the A1Π- X1Σ+ system
in the 12CH+ ion radical have been rephotographed under
high resolution as an emission spectra using a Geissler-type
discharge tube. The conventional technique of spectroscopy has
been implemented. Using the Th lines as a standards, as well as an
interferometric comparator equipped with a photoelectric scanning
device, the 0-0 , 0-1 and 2-1 bands have been
reanalyzed. By means of much longer bands (Jmax = 17 in the
Q(J) branch of the 0-0 band; Jmax = 16 in the R(J)
branch of the 0-1 band; Jmax = 14 in the P(J) and
Q(J) branches of the 2-1 band), than have been observed so
far, as well as the merged calculations, using another five bands
given by Carrington et al. [A. Carrington, D.A. Ramsay, Phys.
Scripta 25, 272 (1982)] additionally, more accurate molecular
constants for the X1Σ+ state, the improved reduced
band system origin Te = 24118.726 (14) cm-1 as well as for
the first time the equilibrium molecular constants with their one
standard deviation for the A1Π state in the CH+ molecule
have been computed: ωe'=1864.402(22),
ωexe'=115.832(14), ωeye'= 2.6301(24),
Be'=11.88677(72), αe'= 0.9163(18), γe'=
-2.29(12)×10-2, εe'= 4.95(20)×10-3,
De'=1.92960(31)×10-3, βe'=
1.0733(50)×10-4, δe'= -1.312(16)×10-5,
, αqe'=
-3.14(16)×10-3, and qDe'= -2.20(14)×10-5
cm-1. Only in our research the addition to the zero-point
energy Y'00=-1.9430 cm-1 and
cm-1
have been calculated. The equilibrium bond lengths of
r'e=1.235053(37) ? and
? for the
A1Π and X1Σ+ states, respectively have been
computed. Full quantum-mechanics characteristic of the A-X
bands system in the 12CH+ molecule, i.e. RKR turning
points, the Franck-Condon factors and r-centroids have been
obtained. Dissociation energies DeX1 Σ+=(38470±
3503) cm-1 and DeA1 Π= (14415 ±3509) cm-1
for the molecule under consideration have been estimated. 相似文献
6.
The origin band of the 2760 å system of p-chlorofluorobenzene has been shown to be a type B band of a prolate asymmetric top. The electronic assignment of the system is therefore 1 B 2-1 A 1. The excited state rotational constants are: compared with the estimated ground state constants: The rotational origin of the band is at 36275·1 ± 0·2 cm-1. 相似文献
7.
8.
《Journal of Molecular Spectroscopy》1986,118(2):363-382
The Asundi system (a′3Σ+-a3Π) of 13C16O has been studied between 3500 and 12 000 cm−1 by high-resolution Fourier transform spectroscopy. The 10 bands, 0-0, 0−1, 1−0, 1−1, 1−2, 2−0, 2−1, 3−0, 4−0, and 4−2, were analyzed taking into account the strong perturbations appearing in the a′3Σ+ (v = 0,…,4) levels. Accurate perturbation parameters were obtained for all interacting states. 相似文献
9.
The emission spectrum of the B2Σ+-X2Σ+ (First Negative) system of the molecular ion 12C18O+ have been photographed at a resolution sufficient to observe the spin splitting of the lines with N > 18. Four bands, 0-1, 0-3, 1-4 and 2-5, have been rotationally analyzed and the molecular constants of the B2Σ+ , v = 0,1, 2 and X2Σ+ , v =1, 3, 4, 5 have been obtained. 相似文献
10.
《Journal of Molecular Spectroscopy》1987,125(1):54-65
The First Negative bands of 12C16O+ and 13C16O+, in the spectral region 40 000–46 000 cm−1, have been photographed at a resolution sufficient to resolve the spin-doubled components. These data for 12C16O+, along with previously reported data of the same transitions, as well as microwave transitions of 12C16O+ in the ground state, have been explicitly included in a least-squares fit to determine the most precise set of molecular constants to date for the B2Σ+ and X2Σ+ states of 12C16O+. Furthermore, we report a rotational analysis of the First Negative bands of 13C16O+ for the first time. Several molecular constants characterizing 13C16O+ in the B2Σ+ and the X2Σ+ states, including spin-doubling parameters, have been determined. 相似文献
11.
Ling Wu Xiao-hua Yang Kakule Kaniki Chuan-liang Li Yang-qin Chen 《Journal of Quantitative Spectroscopy & Radiative Transfer》2012,113(1):82-86
The rotationally resolved spectra of the c3Πu–b3Πg system of P2 in the 16620–17860 cm?1 region is reanalyzed here to obtain more assignments of the rotational lines and more accurate molecular constants. Approximately 500 spectral lines were assigned to six subbands: the Ω=0, 1 and 2 components of the (2, 3) band, the Ω=0 and 2 components of the (1, 3) band and the Ω=2 component of the (1, 2) band. Because of perturbations in the c3Πu (υ=2) state, the Λ-doubling in the 3Π2–3Π2 subband of the (2, 3) band was resolved. By the weighted nonlinear least-squares fitting using two types of effective Hamiltonians, more accurate molecular constants for the υ′=1 and 2 levels in the c3Πu state and for the υ″=2 and 3 levels in the b3Πg state of P2 were derived. 相似文献
12.
The Ångström (B1Σ+-A1Π) band system of the 13C18O molecule, excited in a hollow-cathode discharge tube, has been observed in the region 4100–6500Å. All the eight bands of the system, viz., 1-0, 1-1, 0-0, 0–1, 0–2, 0–3, 0–4, and 0–5 were photographed under high resolution and their rotational analyses, except for the apparently complex 0-0 band, have been carried out. Vibrational constants of the B and A states have been obtained from the band origin data. The derived molecular constants (in cm?1, except re in Å) of the B-A system of13C18O are
ωe | ωeXe | Be | αe | re(Å) | |
---|---|---|---|---|---|
B1∑+ | 2012.97 | 12.95 | 1.7805(4) | 0.0219(6) | 1.1198 |
A1II | 1444.49 | 15.73 | 1.4660(5) | 0.0201(1) | 1.2350 |