Zobrazeno 1 - 10
of 673
pro vyhledávání: '"Lique, F."'
We report the derivation of rate coefficients for the rotational (de-)excitation of PO$^+$ induced by collisions with H$_2$. The calculations were performed on a four-dimensional potential energy surface, obtained on top of highly accurate $ab$ $init
Externí odkaz:
http://arxiv.org/abs/2310.08052
Ammonia is one of the most widely observed molecules in space, and many observations are able to resolve the hyperfine structure due to the electric quadrupole moment of the nitrogen nucleus. The observed spectra often display anomalies in the satell
Externí odkaz:
http://arxiv.org/abs/2309.01542
Autor:
Giers, K., Spezzano, S., Caselli, P., Wirström, E., Sipilä, O., Pineda, J. E., Redaelli, E., Bop, C. T., Lique, F.
Publikováno v:
A&A 676, A78 (2023)
In the centre of pre-stellar cores, deuterium fractionation is enhanced due to the low temperatures and high densities. Therefore, the chemistry of deuterated molecules can be used to study the earliest stages of star formation. We analyse the deuter
Externí odkaz:
http://arxiv.org/abs/2306.12775
Autor:
Navarro-Almaida, D., Bop, C. T., Lique, F., Esplugues, G., Rodríguez-Baras, M., Kramer, C., Romero, C. E., Fuente, A., Caselli, P., Riviére-Marichalar, P., Kirk, J. M., Chacón-Tanarro, A., Roueff, E., Mroczkowski, T., Bhandarkar, T., Devlin, M., Dicker, S., Lowe, I., Mason, B., Sarazin, C. L., Sievers, J.
Publikováno v:
A&A 670, A110 (2023)
HCN, HNC, and their isotopologues are ubiquitous molecules that can serve as chemical thermometers and evolutionary tracers to characterize star-forming regions. Despite their importance in carrying information that is vital to studies of the chemist
Externí odkaz:
http://arxiv.org/abs/2212.07675
Publikováno v:
MNRAS 516 5964 (2022)
We present the first set of rate coefficients for the rotational excitation of the 7 lowest levels of hydrogen fluoride (HF) induced by collision with water molecules, the dominant collider in cometary comas, in the 5-150 K temperature range. The cal
Externí odkaz:
http://arxiv.org/abs/2210.11967
Autor:
Asensio, J. Ferrer, Spezzano, S., Caselli, P., Alves, F. O., Sipilä, O., Redaelli, E., Bizzocchi, L., Lique, F., Mullins, A.
Spectral line profiles of several molecules observed towards the pre-stellar core L1544 appear double-peaked. For abundant molecular species this line morphology has been linked to self-absorption. However, the physical process behind the double-peak
Externí odkaz:
http://arxiv.org/abs/2209.02489
Autor:
Cordiner, M. A., Coulson, I. M., Garcia-Berrios, E., Qi, C., Lique, F., Zoltowski, M., de Val-Borro, M., Kuan, Y. -J., Ip, W. -H., Mairs, S., Roth, N. X., Charnley, S. B., Milam, S. N., Tseng, W. -L, Chuang, Y. -L
The coma of comet C/2016 R2 (PanSTARRS) is one of the most chemically peculiar ever observed, in particular due to its extremely high CO/H2O and N2+/H2O ratios}, and unusual trace volatile abundances. However, the complex shape of its CO emission lin
Externí odkaz:
http://arxiv.org/abs/2202.11849
Publikováno v:
J. Chem. Phys. 155, 234306 (2021)
In light of its ubiquitous presence in the interstellar gas, the chemistry and reactivity of the HCO+ ion requires special attention. The availability of up-to-date collisional data between this ion and the most abundant perturbing species in the int
Externí odkaz:
http://arxiv.org/abs/2201.04530
Autor:
Dzenis, K., Faure, A., McGuire, B. A., Remijan, A. J., Dagdigian, P. J., Rist, C., Dawes, R., Quintas-Sanchez, E., Lique, F., Hochlaf, M.
The first set of theoretical cross sections for propylene oxide (CH3CHCH2O) colliding with cold He atoms has been obtained at the full quantum level using a high-accuracy potential energy surface. By scaling the collision reduced mass, rotational rat
Externí odkaz:
http://arxiv.org/abs/2112.08924
Publikováno v:
A&A 658, A168 (2022)
The abundance of volatile sulfur in dense clouds is long-standing problem in studies of the physics and chemistry of star-forming regions. Sulfur is an important species because its low ionization potential may possibly make it an important charge ca
Externí odkaz:
http://arxiv.org/abs/2112.01076