X-ray photodesorption Archives

Astrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biophysics, Biosignatures & Paleobiology, Icy Worlds, Imaging & Spectroscopy, Interstellar, Radiation, Status Report

X-ray Photodesorption Of Complex Organic Molecules In Protoplanetary Disks

by Keith CowingSeptember 23, 2025September 23, 2025

Context. Nonthermal desorption from interstellar ices induced by X-rays, known as X-ray photodesorption, is a possible route to explain gas phase molecules detected in protoplanetary disks. However, the efficiency of […]

TEYs in the N K edge region of a pure CH3CN ice at 15 K (top left panel; the inset shows the region near the N 1s → π ∗ resonance for an ice irradiated at 15 K and 90 K for the lower and upper curve, respectively; these curves are shifted vertically for more clarity), of a mixed H2O:CH3CN ice irradiated at 15 K with a dilution ratio of 1:1 and 10:1 (top and bottom right panel, respectively), and of a mixed 13CO:CH3CN ice irradiated at 15 K with a dilution ratio of 1:1 (bottom left panel). The photon fluence received by the ice before each TEY measurement is also displayed. The spectral width of the beam was set to 1.2 eV for all the TEY measurements, except for the one corresponding to the red curve in the bottom right panel, for a H2O:CH3CN ice having received a photon fluence of 1×1017 photons.cm−2 and for which the spectral width was 90 meV. The inset in the bottom right panel zooms into the TEY measured on the H2O:CH3CN (10:1) ice for a photon fluence of 1017 photons.cm−2 , where the vibrational structure of the core hole state of N2 formed near the ice surface can be seen near 401 eV. The ices have a total thickness of ∼ 100 ML.\ -- astro-ph.IM

Astrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology, Imaging & Spectroscopy, Status Report

X-ray Photodesorption Of Complex Organic Molecules In Protoplanetary Disks — I. Acetonitrile CH3CN

by Keith CowingJuly 1, 2023

X-rays emitted from pre-main-sequence stars at the center of protoplanetary disks can induce nonthermal desorption from interstellar ices populating the cold regions. This X-ray photodesorption needs to be quantified for […]

X-ray photodesorption

X-ray Photodesorption Of Complex Organic Molecules In Protoplanetary Disks

X-ray Photodesorption Of Complex Organic Molecules In Protoplanetary Disks — I. Acetonitrile CH3CN

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