Results 41 to 50 of about 1,574,076 (309)

Submillimeter spectroscopy and astronomical searches of vinyl mercaptan, C2H3SH [PDF]

open access: yesAstronomy & Astrophysics, 2019
Context. New laboratory investigations of the rotational spectrum of postulated astronomical species are essential to support the assignment and analysis of current astronomical surveys.
M. Martin‐Drumel   +10 more
semanticscholar   +1 more source

Astrophotonic Spectrographs

open access: yesApplied Sciences, 2019
Astrophotonics is the application of photonic technologies to channel, manipulate, and disperse light from one or more telescopes to achieve scientific objectives in astronomy in an efficient and cost-effective way.
Pradip Gatkine   +2 more
doaj   +1 more source

Rotational and Rotational-Vibrational Raman Spectroscopy of Air to Characterize Astronomical Spectrographs. [PDF]

open access: yesPhysical Review Letters, 2019
Raman scattering enables unforeseen uses for the laser guide-star system of the Very Large Telescope. Here, we present the observation of one up-link sodium laser beam acquired with the ESPRESSO spectrograph at a resolution λ/Δλ∼140 000.
F. Vogt   +16 more
semanticscholar   +1 more source

Overview of the Instrumentation for the Dark Energy Spectroscopic Instrument

open access: yesThe Astronomical Journal, 2022
The Dark Energy Spectroscopic Instrument (DESI) embarked on an ambitious 5 yr survey in 2021 May to explore the nature of dark energy with spectroscopic measurements of 40 million galaxies and quasars. DESI will determine precise redshifts and employ the
DESI Collaboration   +269 more
doaj   +1 more source

Laser frequency comb techniques for precise astronomical spectroscopy [PDF]

open access: yes, 2012
Precise astronomical spectroscopic analyses routinely assume that individual pixels in charge-coupled devices (CCDs) have uniform sensitivity to photons. Intra-pixel sensitivity (IPS) vari-ations may already cause small systematic errors in, for example,
M. Murphy   +7 more
semanticscholar   +1 more source

Constrained deconvolution by explicit correction of fourier components of the unknown distribution [PDF]

open access: yesSerbian Astronomical Journal, 1999
The physical constraints were applied in the problem of deconvolution by explicitly correcting noise affected Fourier components of the unknown distribution. The method gives the constrained estimate optimal in the quadratic sense, i.e.
Jankov S.
doaj   +1 more source

Rotational Rest Frequencies and First Astronomical Search of Protonated Methylamine

open access: yesFrontiers in Astronomy and Space Sciences, 2022
We report first laboratory rest frequencies for rotational transitions of protonated methylamine, CH3NH3+, measured in a cryogenic 22-pole ion trap machine and employing an action spectroscopy scheme.
Philipp C. Schmid   +8 more
doaj   +1 more source

Comparative Study of Experimental Methods for Measuring Thermal Properties of 100Cr6 Steel Powders

open access: yesAdvanced Engineering Materials, EarlyView.
This study investigates the thermal properties of 100Cr6 steel in both bulk and powder forms. Measuring the very low thermal conductivity typically exhibited by powders poses significant challenges. To address this, two novel measurement techniques—temperature gradient and finite laser pulse response—are introduced and evaluated by comparison with the ...
Junsheng Zhuo   +8 more
wiley   +1 more source

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