Franck–Condon factors for diatomic molecules with anharmonic corrections

“…Ajitha and Hirao [35] have calculated the dipole moments of the X 2 R + and A 2 P states of CN at different internuclear distances using the multi-reference coupled cluster (MRCC) linear response approach. In another study, Meléndez et al [36] have computed Franck-Condon factors for the A 2 P-X 2 R + and B 2 R + -X 2 R + systems of CN.…”

Section: Introductionmentioning

confidence: 99%

Fourier transform emission spectroscopy of the B2Σ+–X2Σ+ system of CN

Ram

Davis

Wallace

et al. 2006

Journal of Molecular Spectroscopy

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“…For the 4PG band model, we assume the vibrational populations reported by Ajello et al (2019). The MLR best fit CB and 1NG populations are shown in Tables 1 and 2, along with FCFs for v'' = 0 reported by Meléndez et al (2002) and Szajna et al (2004), respectively.…”

Section: Muv Electron Impact Spectra Of Comentioning

confidence: 99%

“…The distance that a CO (a 3 Π) molecule will travel also depends on the mean thermal energy of 39 meV at 300 K LEE ET AL. Table 6 of Meléndez et al (2002) v' This work Szajna et al (2004) Figure 6. a This work.…”

Section: Lifetime Of the Co (A 3 π) State From Analysis Of The Cameromentioning

confidence: 99%

Laboratory Study of the Cameron Bands, the First Negative Bands, and Fourth Positive Bands in the Middle Ultraviolet 180–280 nm by Electron Impact Upon CO

et al. 2021

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We have analyzed medium‐resolution (full width at half maximum, FWHM = 1.2 nm), Middle UltraViolet (MUV; 180–280 nm) laboratory emission spectra of carbon monoxide (CO) excited by electron impact at 15, 20, 40, 50, and 100 eV under single‐scattering conditions at 300 K. The MUV emission spectra at 100 eV contain the Cameron Bands (CB) CO(a 3Π → X 1Σ+), the fourth positive group (4PG) CO(A 1Π → X 1Σ+), and the first negative group (1NG) CO+(B 2Σ+ → X 2Σ) from direct excitation and cascading‐induced emission of an optically thin CO gas. We have determined vibrational intensities and emission cross sections for these systems, important for modeling UV observations of the atmospheres of Mars and Venus. We have also measured the CB “glow” profile about the electron beam of the long‐lived CO (a 3Π) state and determined its average metastable lifetime of 3 ± 1 ms. Optically allowed cascading from a host of triplet states has been found to be the dominant excitation process contributing to the CB emission cross section at 15 eV, most strongly by the d 3Δ and a' 3Σ+ electronic states. We normalized the CB emission cross section at 15 eV electron impact energy by multilinear regression (MLR) analysis to the blended 15 eV MUV spectrum over the spectral range of 180–280 nm, based on the 4PG emission cross section at 15 eV that we have previously measured (Ajello et al., 2019, https://doi.org/10.1029/2018ja026308). We find the CB total emission cross section at 15 eV to be 7.7 × 10−17 cm2.

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“…In this paper, experiments conducted on the induction of plasma in air by a free-oscillated Nd:YAG laser pulse, as well as initial free electrons produced through the interaction of the laser pulse with a coal target are reported and analyzed. The temperature of the plasma is measured by the rotation and vibration temperatures of CN radials, which are determined by the spectral structure of the B 2 P þ / X 2 P þ band [14,15]. A 4-frame CCD camera is employed to analyze the evolution of plasma in air and combustible gas.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of plasma induced by interaction of a free-oscillated laser pulse with a coal target in air and combustible gas

Yang

Peng

2010

International Journal of Hydrogen Energy

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Free-oscillated Nd:YAG laser Laser ignition Radical spectrumHydrogen-oxygen mixture a b s t r a c t Plasma in the air is successfully induced by a free-oscillated Nd:YAG laser pulse with a peak power of 10 2-3 W. The initial free electrons for the cascade breakdown process are from the ablated particles from the surface of a heated coal target, likewise induced by the focused laser beam. The laser field compensates the energy loss of the plasma when the corresponding temperature and the images are investigated by fitting the experimental spectra of B 2 P þ / X 2 P þ band of CN radicals in the plasma with the simulated spectra and a 4-frame CCD camera. The electron density is estimated using a simplified Kramer formula. As this interaction occurs in a gas mixture of hydrogen and oxygen, the formation and development of the plasma are weakened or restrained due to the chaining branch reaction in which the OH radicals are accumulated and the laser energy is consumed.Moreover, this laser ignition will initiate the combustion or explosion process of combustible gas and the minimum ignition energy is measured at different initial pressures. The differences in the experimental results compared to those induced by a nanosecond Q-switched laser pulse with a peak power of 10 6-8 W are also discussed.

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Franck–Condon factors for diatomic molecules with anharmonic corrections

Cited by 13 publications

References 17 publications

Fourier transform emission spectroscopy of the B2Σ+–X2Σ+ system of CN

Fourier transform emission spectroscopy of the B2Σ+–X2Σ+ system of CN

Laboratory Study of the Cameron Bands, the First Negative Bands, and Fourth Positive Bands in the Middle Ultraviolet 180–280 nm by Electron Impact Upon CO

Characteristics of plasma induced by interaction of a free-oscillated laser pulse with a coal target in air and combustible gas

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