The influence of substituent position on the excited state dynamics operating in 4-, 5- and 6-hydroxyindole

Thermal desorption effects on fragment ion production from multi-photon ionized uridine and selected analogues

“…The OU laser-based thermal desorption source is a simple adaptation of systems developed by Greenwood, Townsend and co-workers at Queen's University Belfast 4,37,38 and Heriot-Watt University. [33][34][35] It has been exploited in previous published work on uracil 33 and 5-uorouracil 32 but its specics are described here for the rst time. The backplate of the mass spectrometer has been modied such that a piece of stainlesssteel foil (thickness 10 mm) can be gripped between an inner ring and an outer ring as shown in the detailed top view of Fig.…”

“…Laser-induced acoustic desorption (LIAD) is the best-known method of this kind; laser pulses striking one side of a metal foil result in desorption from a thin sample layer (#mm-order thickness) on the other side via a combination of thermal and non-thermal processes. 30,31 Laserbased thermal desorption 4,32,[33][34][35] differs from LIAD in that it applies a continuous wave (CW) laser to heat the foil and the desorption process is purely thermal. This relatively new technique (rst reported in 2015 (ref.…”

Velocity-map imaging of photoelectron circular dichroism in non-volatile molecules using a laser-based desorption source

“…The LBD set-up used for this work is based on the initial approach employed by Greenwood and co-workers 12,13 and has been used previously within our research group for performing time-resolved ion-yield measurements. [30][31][32] PECD effects in low vapour pressure systems (including phenylalanine) have also been studied using LBD sources, but have made use of the stereocollection technique discussed earlier. 15,19,20 The work presented here represents the first demonstration of how such an LBD apparatus may be exploited specifically for much more powerful imaging applications.…”

Photoprotective Properties of Eumelanin: Computational Insights into the Photophysics of a Catechol:Quinone Heterodimer Model System

“…Several studies have sought to address these issues by exploring aspects of the photophysics prevailing within individual molecular components of eumelanin-including DHI [79][80][81][82] and DHICA [75,[83][84][85], various monohydroxyindoles [86,87] and catechol [88][89][90][91][92][93] in the gas and/or solution phase. Building on earlier work by Van Anh and Williams [94], Kohler and co-workers [95] recently reported ultrafast transient absorption studies following UV photoexcitation of non-covalently bonded heterodimers based on ortho-positioned dihydroxyphenol (catechol) and 1,2-benzoquinone groups.…”