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Outputs (218)

The chemistry and excitation of H2 and HD in the early Universe (2024)
Journal Article
Faure, A., Hily-Blant, P., Pineau des Forêts, G., & Flower, D. R. (2024). The chemistry and excitation of H2 and HD in the early Universe. Monthly Notices of the Royal Astronomical Society, 531(1), 340-354. https://doi.org/10.1093/mnras/stae994

We have critically reviewed the literature pertaining to reactions that are significant for the chemistry of hydrogen-, deuterium-, and helium-bearing species in the homogeneous early Universe. For each reaction rate coefficient, we provide a fit in... Read More about The chemistry and excitation of H2 and HD in the early Universe.

Collisions of electrons with interstellar grains (2024)
Journal Article
Flower, D. R. (2024). Collisions of electrons with interstellar grains. Monthly Notices of the Royal Astronomical Society, 529(4), 3284-3288. https://doi.org/10.1093/mnras/stae678

We have computed cross-sections for elastic and inelastic scattering of electrons on small grains at low-collision energies. Significant differences are again found between the results obtained in the presence and the absence of a ‘permanent’ grain d... Read More about Collisions of electrons with interstellar grains.

Electron attachment to interstellar grains (2004)
Journal Article
Flower, D., & Middleton, M. (2004). Electron attachment to interstellar grains. Monthly Notices of the Royal Astronomical Society, 352, 837-840

Multiply-deuterated species in prestellar cores (2004)
Journal Article
Flower, D., Pineau des Forêts, G., & Walmsley, C. (2004). Multiply-deuterated species in prestellar cores. Astronomy & Astrophysics, 427(3), 887-893. https://doi.org/10.1051/0004-6361%3A20041464

We have studied the ortho, para, and, in the case of D3+, meta forms of the multiply-deuterated isotopes of H3+, under physical conditions believed to be appropriate to pre-protostellar cores. As deuterons have integral nuclear spin, I = 1, Bose-Eins... Read More about Multiply-deuterated species in prestellar cores.

The rotational excitation of methanol by para-hydrogen (2004)
Journal Article
Pottage, J., Flower, D., & Davis, S. (2004). The rotational excitation of methanol by para-hydrogen. Monthly Notices of the Royal Astronomical Society, 352(1), 39-43. https://doi.org/10.1111/j.1365-2966.2004.07888.x

In this paper, we present the results of calculations of cross-sections and rate coefficients for rotationally inelastic transitions in methanol (CH3OH), in its ground torsional state, induced by collisions with para-H2 in its ground rotational state... Read More about The rotational excitation of methanol by para-hydrogen.

The influence of grains on the propagation and structure of C-type shock waves in interstellar molecular clouds (2003)
Journal Article
Flower, D., & Pineau des Forêts, G. (2003). The influence of grains on the propagation and structure of C-type shock waves in interstellar molecular clouds. Monthly Notices of the Royal Astronomical Society, 343(2), 390-400. https://doi.org/10.1046/j.1365-8711.2003.06716.x

Gas–grain interactions can have important consequences for the physics and chemistry of shock waves propagating in molecular clouds. The grains can be both a source and a sink of molecules, and their inertia can modify the dynamics of the propagation... Read More about The influence of grains on the propagation and structure of C-type shock waves in interstellar molecular clouds.

H₂ in space (2002)
Journal Article
Flower, D. (2002). H₂ in space

New determinations of the critical velocities of C-type shock waves in dense molecular clouds: application to the outflow source in Orion (2002)
Journal Article
Le Bourlot, J., Pineau des Forêts, G., Flower, D., & Cabrit, S. (2002). New determinations of the critical velocities of C-type shock waves in dense molecular clouds: application to the outflow source in Orion. Monthly Notices of the Royal Astronomical Society, 332(4), 985-993. https://doi.org/10.1046/j.1365-8711.2002.05373.x

We report calculations of the intensities of rovibrational transitions of H2 emitted from C-type shock waves propagating in molecular gas. Attention was paid to the thermal balance of the gas and to the rates of collisional dissociation and ionizatio... Read More about New determinations of the critical velocities of C-type shock waves in dense molecular clouds: application to the outflow source in Orion.

The cooling of astrophysical media by HD (2000)
Journal Article
Flower, D., Le Bourlot, J., Pineau des Forêts, G., & Roueff, E. (2000). The cooling of astrophysical media by HD. Monthly Notices of the Royal Astronomical Society, 314, 753-758

H₂ in Space (2000)
Presentation / Conference Contribution

From 28 September to 1 October 1999, an international conference entitled 'H2 in Space' was held at the Institut d'Astrophysique in Paris. The meeting reviewed the current state of knowledge of the theoretical, experimental and observational properti... Read More about H₂ in Space.

Silicon chemistry in PDRs (1999)
Journal Article
Walmsley, C., Pineau des Forêts, G., & Flower, D. (1999). Silicon chemistry in PDRs. Astronomy and Astrophysics, 342, 542-550

SiO production in interstellar shocks. (1997)
Journal Article
Schilke, P., Walmsley, C., Pineau des Forets, G., & Flower, D. (1997). SiO production in interstellar shocks. Astronomy and Astrophysics, 321, 293-304

Hot shocked ammonia towards SGR B2 (1995)
Journal Article
Flower, D., Pineau des Forets, G., & Walmsley, C. (1995). Hot shocked ammonia towards SGR B2. Astronomy and Astrophysics, 294, 815-824

Atomic carbon in interstellar clouds (1994)
Journal Article
Flower, D., Le Bourlot, J., Pineau Des Forets, G., & Roueff, E. (1994). Atomic carbon in interstellar clouds. Astronomy and Astrophysics, 282, 225-232

Ionization and charge transfer in proton-helium collisions. (1991)
Journal Article
Slim, H., Heck, E., Bransden, B., & Flower, D. (1991). Ionization and charge transfer in proton-helium collisions. Journal of Physics B: Atomic, Molecular and Optical Physics, 24(17), L421-L424. https://doi.org/10.1088/0953-4075/24/17/002

Cross sections have been calculated for single ionization in collisions between protons and helium atoms, in the range of projectile energies 25-100 keV. The semiclassical impact parameter method was employed, with a basis comprising 22 states on the... Read More about Ionization and charge transfer in proton-helium collisions..

Theoretical differential cross sections for proton-helium scattering at intermediate energies. (1991)
Journal Article
Slim, H., Heck, E., Bransden, B., & Flower, D. (1991). Theoretical differential cross sections for proton-helium scattering at intermediate energies. Journal of Physics B: Atomic, Molecular and Optical Physics, 24(9), 2353-2358. https://doi.org/10.1088/0953-4075/24/9/014

Differential cross sections for collisions between protons and helium atoms have been calculated in the range of impact energies from 25-100 keV. The eikonal formula for the differential cross section was used, in conjunction with semiclassical trans... Read More about Theoretical differential cross sections for proton-helium scattering at intermediate energies..

Charge transfer and excitation in proton-helium collisions. (1991)
Journal Article
Slim, H., Heck, E., Bransden, B., & Flower, D. (1991). Charge transfer and excitation in proton-helium collisions. Journal of Physics B: Atomic, Molecular and Optical Physics, 24(7), 1683-1694. https://doi.org/10.1088/0953-4075/24/7/021

Using the semiclassical impact parameter method, the authors have computed cross sections for excitation of He by H+ and for one-electron charge transfer, the collision energy being in the range from 10-235 keV. A basis of travelling atomic orbitals... Read More about Charge transfer and excitation in proton-helium collisions..

Propensity rules in NH3-H2 collisions (1989)
Journal Article
Offer, A., & Flower, D. (1989). Propensity rules in NH3-H2 collisions. Journal of Physics B: Atomic, Molecular and Optical Physics, 22, L439-L443

Rotational excitation of para-NH3 by para-H2 (1987)
Journal Article
Danby, G., Flower, D., Valiron, P., Kochanski, E., & Kurdi, L. (1987). Rotational excitation of para-NH3 by para-H2. Journal of Physics B: Atomic, Molecular and Optical Physics, 20, 1039-1058

CORRIGENDUM: Rotational excitation of para-NH₃ by para-H₂ (1987)
Journal Article
Danby, G., Flower, D., Valiron, P., Kochanski, E., Kurdi, L., & Diercksen, G. (1987). CORRIGENDUM: Rotational excitation of para-NH₃ by para-H₂. Journal of Physics B: Atomic, Molecular and Optical Physics, 20, 3937-

Book-Review - Planetary Nebulae (1984)
Journal Article
Flower, D., & Gathier, R. (1984). Book-Review - Planetary Nebulae. Space Science Reviews, 37, 401-

A search for absorption in the fourth positive system of CO in the spectrum of the planetary nebula IC 418. (1980)
Journal Article
Clavel, J., & Flower, D. (1980). A search for absorption in the fourth positive system of CO in the spectrum of the planetary nebula IC 418. Monthly Notices of the Royal Astronomical Society, 190(1), 1P-4P. https://doi.org/10.1093/mnras/190.1.1p

The continuous emission of IC 418 has been observed at high dispersion with the IUE satellite and the spectrum searched for the A1Π−X1Σ+A1Π−X1Σ+ bands of CO. It was not possible to unequivocally detect these CO bands in IC418. However, an upper limit... Read More about A search for absorption in the fourth positive system of CO in the spectrum of the planetary nebula IC 418..