The band system of acetylene

Watson, J. K. G.; Herman, Michel; Craen, J.C Van; Colin, Réginald

doi:10.1016/0022-2852(82)90242-9

Cited by 161 publications

(101 citation statements)

References 45 publications

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“…Herzberg (1966) and Robin (1985) reviewed in detail the work reported before 1985. More recent aspects include measurements of the absolute cross section for photoabsorption in the Rydberg series of gaseous acetylene in the wavelength region 105-155 nm (Suto & Lee 1984;Cooper et al 1995) and the virtual valence band systemÃ←X at 214-248 nm (Watson et al 1982); the absorption spectrum in solid Ar at 10 K was measured in the wavelength region 107-220 nm (Wu et al 2010). The temperature-dependent measurements of absolute absorption cross sections of gaseous acetylene in the UV and VUV regions include the virtual valence statesÃ←X andB←X in 153-214 nm (Wu et al 1989;Chen et al 1991;Smith et al 1991) and extending to the Rydberg transitions near 120 nm (Wu et al 2001).…”

Section: Introductionmentioning

confidence: 99%

ABSORPTION CROSS SECTION OF GASEOUS ACETYLENE AT 85 K IN THE WAVELENGTH RANGE 110-155 nm

Cheng¹,

Chen²,

Lu³

et al. 2011

ApJS

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Absorption spectra and absorption cross sections of gaseous acetylene, C 2 H 2 , at 298 and 85 K were measured in the wavelength range 110-155 nm with a slit-jet system coupled to a synchrotron as a source of vacuum ultraviolet light. Using published spectral parameters of C 2 H 2 , we simulated the absorption profile for the Rydberg transition to state 4R 0 in the range 124.6-125.1 nm, according to which the temperature of the jet-expanded sample at stagnation pressure 200 Torr is 85 ± 5 K. Our cross sections of C 2 H 2 are applicable for determining properties sensitive to temperature for diagnostic work on Saturn and Titan.

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Section: Introductionmentioning

confidence: 99%

ABSORPTION CROSS SECTION OF GASEOUS ACETYLENE AT 85 K IN THE WAVELENGTH RANGE 110-155 nm

Cheng¹,

Chen²,

Lu³

et al. 2011

ApJS

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“…12,14,[59][60][61][62][63][64][65][66] This state therefore provides optimal testing ground of the algebraic method. There are three fundamental bending vibrations of trans-S 1 with symmetry a u , b u , a g as shown in Fig.…”

Section: Description Of Trans-s 1 Bending Spectrummentioning

confidence: 99%

A study of the bending motion in tetratomic molecules by the algebraic operator expansion method

Larese¹,

Caprio²,

Pérez‐Bernal³

et al. 2014

The Journal of Chemical Physics

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We study the bending motion in the tetratomic molecules C2H2 (˜X 1 + g ), C2H2 ( ˜A 1Au) trans-S1, C2H2 ( ˜A 1A2) cis-S1, and ˜X 1A1 H2CO. We show that the algebraic operator expansion method with only linear terms comprised of the basic operators is able to describe the main features of the level energies in these molecules in terms of two (linear) or three (trans-bent, cis-bent, and branched) parameters. By including quadratic terms, the rms deviation in comparison with experiment goes down to typically ∼10 cm−1 over the entire range of energy 0–6000 cm−1.We determine the parameters by fitting the available data, and from these parameters we construct the algebraic potential functions. Our results are of particular interest in high-energy regions where spectra are very congested and conventional methods, force-field expansions or Dunham-expansions plus perturbations, are difficult to apply

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“…4 The transition is now known to be a π * ← π excitation from the linear ground state to a trans-bent excited state, S 1 (Ã 1 A u ). Further detailed analyses by Watson et al, [5][6][7] the Crim group, 8,9 Yamakita and Tsuchiya, [10][11][12] and Merer et al [13][14][15][16][17] have led to an essentially complete assignment of the vibrational and rotational structure up to 4500 cm −1 above the zero-point level of theÃ state. One of the most interesting results of these analyses has been the discovery 17,18 of bands that belong to the cis-bent isomer of theÃ state, the zero-point level of which lies about 2670 cm −1 higher in energy than that of the trans-bent isomer.…”

Section: Introductionmentioning

confidence: 99%

Probing cis-trans isomerization in the S1 state of C2H2 via H-atom action and hot band-pumped IR-UV double resonance spectroscopies

Changala

Baraban

Merer

et al. 2015

The Journal of Chemical Physics

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Articles you may be interested inVibrational energy relaxation of benzene dimer and trimer in the CH stretching region studied by picosecond time-resolved IR-UV pump-probe spectroscopy J. Chem. Phys. 136, 044304 (2012) Probing cis-trans isomerization in the S 1 state of C 2 H 2 via H-atom action and hot band-pumped IR-UV double resonance spectroscopies We report novel experimental strategies that should prove instrumental in extending the vibrational and rotational assignments of the S 1 state of acetylene, C 2 H 2 , in the region of the cis-trans isomerization barrier. At present, the assignments are essentially complete up to ∼500 cm −1 below the barrier. Two difficulties arise when the assignments are continued to higher energies. One is that predissociation into C 2 H + H sets in roughly 1100 cm −1 below the barrier; the resulting quenching of laser-induced fluorescence (LIF) reduces its value for recording spectra in this region. The other difficulty is that tunneling through the barrier causes a staggering in the K-rotational structure of isomerizing vibrational levels. The assignment of these levels requires data for K values up to at least 3. Given the rotational selection rule K ′ − ℓ ′′ = ±1, such data must be obtained via excited vibrational levels of the ground state with ℓ ′′ > 0. In this paper, high resolution H-atom resonance-enhanced multiphoton ionization spectra are demonstrated to contain predissociated bands which are almost invisible in LIF spectra, while preliminary data using a hyperthermal pulsed nozzle show that ℓ ′′ = 2 states can be selectively populated in a jet, giving access to K ′ = 3 states in IR-UV double resonance. C 2015 AIP Publishing LLC. [http://dx

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The band system of acetylene

Cited by 161 publications

References 45 publications

ABSORPTION CROSS SECTION OF GASEOUS ACETYLENE AT 85 K IN THE WAVELENGTH RANGE 110-155 nm

ABSORPTION CROSS SECTION OF GASEOUS ACETYLENE AT 85 K IN THE WAVELENGTH RANGE 110-155 nm

A study of the bending motion in tetratomic molecules by the algebraic operator expansion method

Probing cis-trans isomerization in the S1 state of C2H2 via H-atom action and hot band-pumped IR-UV double resonance spectroscopies

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