Deperturbation study of the state of C2 by applying degenerate and two-color resonant four-wave mixing

Bornhauser, P.; Knopp, G.; Gerber, T.; Radi, P. P.

doi:10.1016/j.jms.2010.05.008

Cited by 21 publications

(26 citation statements)

References 34 publications

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“…It is important to notice that by labeling of single rovibronic transitions by the PUMP photons a further reduction of the complexity is possible and often used to unambiguously assign spectral features. An example is shown in a recent deperturbation analysis of the the d 3 Π g , v ′ = 4 state of C 2 where weak excitations have been detected in a spectral region of bright and overlapping transitions …”

Section: Resultsmentioning

confidence: 99%

“…Our group has previously used TC‐RFWM and its one‐color analogue degenerate four‐wave mixing (DFWM) in the study of C 2 and C 3 among other molecules . In recent studies, the deperturbation of the v = 6 level of the d 3 Σ g state led to the discovery of the first quintet state of C 2 , 1 5 Σ g , which was then used as a gateway into the quintet manifold and allowed the measurement of the first quintet–quintet transition in dicarbon .…”

Section: Introductionmentioning

confidence: 99%

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Unraveling the electronic structure of transition metal dimers using resonant four‐wave mixing

Visser

Beck

Bornhauser

et al. 2015

J Raman Spectroscopy

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The potential of two-color resonant and degenerate four-wave mixing spectroscopy for investigations of the complex spectra of transition metal dimers is explored. Two-color resonant and degenerate four-wave mixing spectroscopy scans of the well-known A-X and B-X transitions in Cu 2 are reported and compared with previous experimental data obtained from standard singleresonance techniques. The selectivity of the method is shown to enable the measurement of isotopologue pure spectra without the need for isotopically enriched metal targets. Specific subsets of the rovibronic structure are separated in a congested spectral region of overlapping transitions. The sensitivity of the method compares satisfactorily with linear spectroscopic methods such as laser-induced fluorescence and cavity ring-down. A new laser vaporization source for the production of transition metal dimers and clusters has been constructed. The new design aims for a high number density and maximum possible shot-to-shot stability. The possibilities of further applications of non-linear four-wave mixing spectroscopy to Cu 2 and other transition metal dimers are discussed.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Unraveling the electronic structure of transition metal dimers using resonant four‐wave mixing

Visser

Beck

Bornhauser

et al. 2015

J Raman Spectroscopy

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“…8 The Dunham expansion coefficients listed in Table VI are used for evaluating the T v and B v values for the b 3 − g , B 1 g , and 1 5 g states. The coefficients for the b 3 − g state were re-determined including the recently reported term values and rotational constants of the v = 16 and 19 levels, which were derived from the perturbations observed in the Swan bands, 3,32 in order to accurately estimate the molecular constants for higher vibrational levels. Although the vibrational quantum number has not been identified for the reported vibrational level for the 1 5 g state at 29 258.6 cm −1 , 3 we assume that the reported value is of the v = 0 level, since the experimentally derived rotational constant is quite close to the rotational constant of v = 0 computed from a high-level ab initio potential of the 1 5 g state.…”

Section: B Perturbation In the V = 8 Level Of The D 3 G Statementioning

confidence: 99%

Spectroscopic observation of higher vibrational levels of C2 through visible band systems

Nakajima

Endo

2013

The Journal of Chemical Physics

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Higher vibrational levels of the C2 molecule than those observed so far were investigated for the X(1)Σ(g)(+), A(1)Π(u), a(3)Π(u), c(3)Σ(u)(+), and d(3)Π(g) states through the Phillips, Swan, and d(3)Π(g)-c(3)Σ(u)(+) band systems under a jet-cooled condition. The term values and the molecular constants for 21 new vibronic levels were determined from rotationally resolved excitation spectra. The determined term values and rotational constants were compared to those derived from high-level ab initio potential curves. Perturbations identified in low J levels of the d(3)Π(g) (v = 8) state are most likely to be caused by the 1(5)Π(g) (v = 3) state.

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“…The next largest available diatomic line list is that for C 2 which is one of a number of diatomics species for which line lists have been provided by Kurucz. Recently, however, there have been several new experimental measurements on this system, including the characterization of entirely new, low‐lying electronic bands (Kokkin et al ; Joester et al ; Tanabashi et al ; Nakajima et al ; Bornhauser et al , ). This work has been accompanied by significantly improved ab initio electronic structure calculations (Kokkin, Bacskay & Schmidt ; Schmidt & Bacskay , ; Nakajima et al ).…”

Section: The Current Situationmentioning

confidence: 99%

ExoMol: molecular line lists for exoplanet and other atmospheres

Tennyson¹,

Yurchenko²

2012

Monthly Notices of the Royal Astronomical Society

416

280

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Context. Opacities of molecules in exoplanet atmospheres rely on increasingly detailed line-lists for these molecules. The line lists available today contain for many species up to several billions of lines. Computation of the spectral line profile created by pressure and temperature broadening, the Voigt profile, of all of these lines is becoming a computational challenge. Aims. We aim to create a method to compute the Voigt profile in a way that automatically focusses the computation time into the strongest lines, while still maintaining the continuum contribution of the high number of weaker lines. Methods. Here, we outline a statistical line sampling technique that samples the Voigt profile quickly and with high accuracy. The number of samples is adjusted to the strength of the line and the local spectral line density. This automatically provides high accuracy line shapes for strong lines or lines that are spectrally isolated. The line sampling technique automatically preserves the integrated line opacity for all lines, thereby also providing the continuum opacity created by the large number of weak lines at very low computational cost. Results. The line sampling technique is tested for accuracy when computing line spectra and correlated-k tables. Extremely fast computations (∼ 3.5 · 10 5 lines per second per core on a standard current day desktop computer) with high accuracy (≤ 1% almost everywhere) are obtained. A detailed recipe on how to perform the computations is given.

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Deperturbation study of the state of C2 by applying degenerate and two-color resonant four-wave mixing

Cited by 21 publications

References 34 publications

Unraveling the electronic structure of transition metal dimers using resonant four‐wave mixing

Unraveling the electronic structure of transition metal dimers using resonant four‐wave mixing

Spectroscopic observation of higher vibrational levels of C2 through visible band systems

ExoMol: molecular line lists for exoplanet and other atmospheres

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