1. What contributions have the authors mentioned in the paper "A novel multiplex absorption spectrometer for time-resolved studies" ?
In this paper, a Time-Resolved Ultraviolet / Visible ( UV/Vis ) Absorption Spectrometer ( TRUVAS ) has been developed that can simultaneously monitor absorption at all wavelengths between 200 800 nm with millisecond time resolution.
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![Figure 3: An example of the effect of pinning on a time resolved absorption trace (1 ms time resolution, wavelength = 325 nm). The black trace is unpinned, raw data and the red trace is pinned using the 500 - 600 nm region, where the absorbing species (isoprene hydroxyperoxy radical) has a negligible absorption cross section, reducing the noise due to fluctuations in lamp intensity. The red trace displays significantly less random fluctuation in lamp intensity compared to the black trace, see text for further details. Conditions: [H2O2] = 6.4×1015 molecule cm-3; [OH] = 7.6×1013 molecule cm-3; total pressure = 82 Torr. [Isoprene] was > 10× [H2O2] and the excimer energy was 52.3 mJ pulse-1 cm-2.](/figures/figure-3-an-example-of-the-effect-of-pinning-on-a-time-2urg7fo4.webp)
![Figure 6: HOCH2CH2O2 absorption cross sections. The solid blue line represents the cross sections from the fit to the single pass TRUVAS data. The multipass cross sections, red, and its error bars are assigned equal to the variability from repeated experiments. The crosses represent cross sections measured by Lightfoot et al.31 Currently the smallest measured cross sections in the literature are around 7.7 × 10-19 cm2 molecule-1 at 300 nm. The experimental data obtained using this instrument measure the HOCH2CH2O2 cross section down to ~2.2 × 10-20 at ~340 nm, which represents in excess of an order of magnitude greater sensitivity compared to previous measurements. This data were obtained from experiments where [H2O2],](/figures/figure-6-hoch2ch2o2-absorption-cross-sections-the-solid-blue-3bupeli9.webp)
