Publications (21)
Velocity-resolved [CII] emission and [CII]/FIR Mapping along Orion with Herschel
J. R. Goicoechea, D. Teyssier, M. Etxaluze +22
We present the first 7.5'x11.5' velocity-resolved map of the [CII]158um line toward the Orion molecular cloud-1 (OMC-1) taken with the Herschel/HIFI instrument. In combination with…
Herschel/HIFI observations of interstellar OH+ and H2O+ towards W49N: a probe of diffuse clouds with a small molecular fraction
D. A. Neufeld, J. R. Goicoechea, P. Sonnentrucker +50
We report the detection of absorption by interstellar hydroxyl cations and water cations, along the sight-line to the bright continuum source W49N. We have used Herschel's HIFI ins…
Understanding ice and water film formation on soil particles by combining DFT and Casimir-Lifshitz forces
M. Boström, S. Kuthe, S. Carretero-Palacios +7
Thin films of ice and water on soil particles play crucial roles in environmental and technological processes. Understanding the fundamental physical mechanisms underlying their fo…
Trapping in a Casimir Force Set-Up Controlled by Solution Permeability
S. Pal, L. Inacio, L. M. Woods +3
We have designed a system enabling tuning Casimir attraction/repulsion transitions between a polystyrene sphere attached to an atomic force microscope tip near a Teflon surface in…
The influence of Lifshitz forces and gas on premelting of ice within porous materials
M. Boström, O. I. Malyi, P. Thiyam +4
Premelting of ice within pores in earth materials is shown to depend on the presence of vapor layers. For thick vapor layers between ice and pore surfaces, a nanosized water sheet…
Finite size dependent dispersion potentials between atoms and ions dissolved in water
P. Thiyam, M. Boström, C. Persson +3
A non-expanded theory is used for dispersion potentials between atoms and ions dissolved in a medium. The first-order dispersion interaction between two atoms in an excited state m…
Magnetism in Exact Exchange Density Functional Theory
S. Sharma, J. K. Dewhurst, C. Persson +3
The magnetic properties of the intermetallic compound FeAl are investigated using exact exchange density functional theory. This is implemented within a state of the art all-electr…
Effects of van der Waals forces and salt ions on the growth of water films on ice and the detachment of CO bubbles
P. Thiyam, E. R. A. Lima, O. I. Malyi +4
We study the effect of salts on the thickness of wetting films on melting ice and interactions acting on CO bubble near ice-water and vapor-water interfaces. Governing mechanis…
CHEOPS observations of the HD 108236 planetary system: A fifth planet, improved ephemerides, and planetary radii
A. Bonfanti, L. Delrez, M. J. Hooton +106
The detection of a super-Earth and three mini-Neptunes transiting the bright ( = 9.2 mag) star HD 108236 (also known as TOI-1233) was recently reported on the basis of TESS and…
Impact of effective polarisability models on the predicted release dynamics of CH and CO from premelted ice
J. Fiedler, P. Thiyam, F. A. Burger +6
We present a theory for Casimir--Polder forces acting on greenhouse gas molecules dissolved in a thin water film. Such a nanosized film has recently been predicted to arise on th s…
Non-Perturbative Theory of Dispersion Interactions
M. Boström, P. Thiyam, C. Persson +4
Some open questions exist with fluctuation-induced forces between extended dipoles. Conventional intuition derives from large-separation perturbative approximations to dispersion f…
Casimir attractive-repulsive transition in MEMS
M. Boström, S. à . Ellingsen, I. Brevik +3
Unwanted stiction in micro- and nanomechanical (NEMS/MEMS) systems due to dispersion (van der Waals, or Casimir) forces is a significant hurdle in the fabrication of systems with m…
Casimir Force between Atomically Thin Gold Films
M. Boström, C. Persson, Bo E. Sernelius
We have used density functional theory to calculate the anisotropic dielectric functions for ultrathin gold sheets (composed of 1, 3, 6, and 15 atomic layers). Such films are impor…
Non-Perturbative Theory for Dispersion Self-Energy of Atoms
Priyadarshini Thiyam, C. Persson, I. Brevik +2
We go beyond the approximate series-expansions used in the dispersion theory of finite size atoms. We demonstrate that a correct, and non-perturbative, theory dramatically alters t…
A knob to tune the Casimir-Lifshitz force with gapped metals
M. Boström, M. Rizwan Khan, H. R. Gopidi +4
The Casimir-Lifshitz interaction, a long-range force that arises between solids and molecules due to quantum fluctuations in electromagnetic fields, has been widely studied in soli…
Structural Flyby Characterization of Nanoporosity
R. R. Rosa, A. Ferreira da Silva, R. C. Brito +5
Recently, Ferreira da Silva et al. [3] have performed a gradient pattern analysis of a canonical sample set (CSS) of scanning force microscopy (SFM) images of p-Si. They applied th…
Effect of excess charge carriers and fluid medium on the magnitude and the sign of the Casimir-Lifshitz torque
P. Thiyam, Prachi Parashar, K. V. Shajesh +6
Last year, we reported a perturbative theory of the Casimir-Lifshitz torque between planar biaxially anisotropic materials in the retarded limit [Phys. Rev. Lett. {\bf 120}, 131601…
Strong absorption by interstellar hydrogen fluoride: Herschel/HIFI observations of the sight-line to G10.6-0.4 (W31C)
D. A. Neufeld, P. Sonnentrucker, T. G. Phillips +45
We report the detection of strong absorption by interstellar hydrogen fluoride along the sight-line to the submillimeter continuum source G10.6-0.4 (W31C). We have used Herschel's…
Herschel/HIFI measurements of the ortho/para ratio in water towards Sagittarius B2(M) and W31C
D. C. Lis, T. G. Phillips, P. F. Goldsmith +74
We present Herschel/HIFI observations of the fundamental rotational transitions of ortho- and para-HO and HO in absorption towards Sagittarius~B2(M) and W31C. The…
Nanorod Pair Complexes Manipulated via Magnetic Casimir Forces
S Pal, L. M. Woods, C. Persson +3
Controlling nanoscale interactions to suppress aggregation from short-range attractive forces is a key problem in nanoengineering. Here, we demonstrate a route to modulate Casmir-L…
Secondary ice growth mechanism for ice nuclei in the atmosphere
M. Boström, Y. Li, I. Brevik +3
The study of atmospheric ice nuclei is vital for understanding the formation of precipitation and the development of cloud systems as it reveals how these tiny particles grow. A me…