Excitation of the 6d 2D → 6p 2Po Radiative Transitions in the Pb+ Ion by Electron Impact

Results of experimental and theoretical investigation of electron-impact excitation of the 6s26d D2→6s26p P2o spectral transitions from the ground 6s26p P21/2o level in the Pb+ ion are presented. The experimental excitation functions for the transitions, measured by a VUV spectroscopy method, using the crossed electron and ion beams technique, reveal a rather distinct resonance structure resulting mainly from the electron decay of both atomic and ionic autoionizing states. The absolute values of the emission cross-sections, obtained by normalizing the experimental data at the incident electron energy 100 eV by those calculated using the Flexible Atomic Code software package, were found to be (0.35 ± 0.17) × 10–16 cm2 for the 6s26d D23/2 → 6s26p P21/2o (λ143.4 nm) transition and (0.19 ± 0.09) × 10–16 cm2 for the 6s26d D25/2 → 6s26p P23/2o (λ182.2 nm) transition.

Systematic investigation of CO2 : NH3 ice mixtures using mid-IR and VUV spectroscopy – part 2: electron irradiation and thermal processing

The stoichiometric mixing ratio of CO2 : NH3 ice mixtures determines the electron irradiation products at 20 K and the composition of residue material formed after thermal processing.

Systematic investigation of CO2 : NH3 ice mixtures using mid-IR and VUV spectroscopy – part 1: thermal processing

The stoichiometric mixing ratio of CO2 : NH3 ices determines both the initial chemical and physical properties of the ices and their evolution through thermal processing including CO2 bonding environment, NH3 crystallite size and amount of residue.

IR–VUV spectroscopy of pyridine dimers, trimers and pyridine–ammonia complexes in a supersonic jet

The infrared spectra of the C–H stretching vibrations of (pyridine)m, m = 1–3, and the N–H stretching vibrations of (pyridine)m–(NH3)n, m = 1, 2; n = 1–4, complexes were investigated by infrared (IR)–vacuum ultraviolet (VUV) spectroscopy under jet-cooled conditions.

Competition between folded and extended structures of alanylalanine (Ala-Ala) in a molecular beam

Structural analysis of the neutral dipeptide Ala-Ala by action spectroscopy using IRMPD-VUV spectroscopy reveals predominance of extended structure.

Lab-simulated downhole leaching of formaldehyde from proppants by high performance liquid chromatography (HPLC), headspace gas chromatography-vacuum ultraviolet (HS-GC-VUV) spectroscopy, and headspace gas chromatography-mass spectrometry (HS-GC-MS)

Different methods to analyze formaldehyde from proppants was investigated under lab-simulated downhole conditions.

VUV spectroscopy of an electron irradiated benzene : carbon dioxide interstellar ice analogue

We present the first vacuum ultraviolet spectroscopic study of an interstellar ice analogue of a benzene (C6H6) : carbon dioxide (CO2) (1 : 100) mixture which has been energetically processed with 1 keV electrons.