Demonstration of Transmission Mode Soft X-ray NEXAFS Using Third- and Fifth-Order Harmonics of FEL Radiation at SACLA BL1

Iwayama, H.; Nagasaka, Masanari; Inoue, Ituro; Owada, Shigeki; Yabashi, Makina; Harries, James

doi:10.3390/app10217852

Cited by 3 publications

(1 citation statement)

References 29 publications

(36 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…NEXAFS is originally and routinely performed in large beam facilities, i.e. synchrotrons [7] or free electron lasers [8]. It is of high interest to various scientific disciplines such as the study of organic sheets [9], nanoscale samples [10], inorganic polymers [11], and astrophysical dust [12,13].…”

Section: A Laboratory Molecular Absorptionmentioning

confidence: 99%

X-ray absorption of cold gas: Simulating interstellar molecular clouds in the laboratory

Gissis,

Fisher,

Behar

2021

Preprint

View full text Add to dashboard Cite

Galactic and extra-galactic sources produce X-rays that are often absorbed by molecules and atoms in giant molecular clouds (GMCs), which provides valuable information about their composition and physical state. We mimic this phenomenon with a laboratory Z-pinch X-ray source, which is impinged on neutral molecular gas. The novel technique produces a soft X-ray pseudo continuum using a pulsed-current generator. The absorbing gas is injected from a 1 cm long planar gas-puff without any window or vessel along the line of sight. An X-ray spectrometer with a resolving power of λ/∆λ ∼420, comparable to that of astrophysical space instruments, records the absorbed spectra. This resolution clearly resolves the molecular lines from the atomic lines; therefore, motivating the search of molecular signature in astrophysical X-ray spectra. The experimental setup enables different gas compositions and column densities. K-shell spectra of CO2, N2 and O2 reveal a plethora of absorption lines and photo-electric edges measured at molecular column densities between ∼10 16 cm −2 -10 18 cm −2 typical of GMCs. We find that the population of excited-states, contributing to the edge, increases with gas density.

show abstract