Quantifying BrO and SO2 distributions in volcanic plumes—Recent advances in imaging Fabry-Pérot interferometer correlation spectroscopy by Alexander Nies, Alexander Nies, Jaro Heimann, Christopher Fuchs, Christopher Fuchs, Jonas Kuhn, Nicole Bobrowski, Nicole Bobrowski, Ulrich Platt

“…Thus, based on the similarity of the UV absorption cross sections, we used formaldehyde (HCHO) as a spectral proxy for BrO in instrument characterization measurements. …”
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High-temperature mid-IR absorption and reaction kinetics of 2-methyl-1,3-dioxolane: An experimental and theoretical study by Mohammad Adil, Binod Raj Giri, Tam V.-T. Mai, Milán Szőri, Lam K. Huynh, Aamir Farooq

“…We carried out spectroscopic measurements to deduce temperature-dependent absorption cross-sections of 2M13DO over a broad wavelength range of 8.4–10.5 μm (950–1190 cm−1). …”
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Comparison of two photolytic calibration methods for nitrous acid by A. J. Lindsay, E. C. Wood

“…The first method is an adaptation of the common chemical actinometry HO<span class="inline-formula">_<i>x</i></span> calibration method, in which HONO is calculated based on quantified values for [O<span class="inline-formula">₃</span>], [H<span class="inline-formula">₂</span>O], and [O<span class="inline-formula">₂</span>] and the absorption cross sections for H<span class="inline-formula">₂</span>O and O<span class="inline-formula">₂</span> at 184.9 nm. …”
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Using volcanic gases to understand open-vent volcanoes by Barrington, Charlotte

“…Although the wavelength ranges of trace gas absorption cross sections overlap, the occurrence of their narrow-band absorption features is not uniform and when viewed in the wavenumber domain their absorption signatures are distinct. …”
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Gas-phase detection methods using diode lasers by Baran, S, Stuart Baran

“…</p><p>An alternative strategy for increasing the sensitivity of a diode-laser-based gas monitoring technique lies in moving detection to the mid-infrared region, where the absorption cross-sections are generally larger. With this motivation, difference frequency generation is presented, to produce radiation close to 3.5 µm which is then applied to a series of different enhanced spectroscopy techniques. …”

A lightweight broadband cavity-enhanced spectrometer for NO₂ measurement on uncrewed aerial vehicles by C. C. Womack, C. C. Womack, S. S. Brown, S. S. Brown, S. J. Ciciora, R.-S. Gao, R. J. McLaughlin, M. A. Robinson, M. A. Robinson, Y. Rudich, R. A. Washenfelder

“…The instrument uses a light-emitting diode (LED) centered at 457 nm, high-finesse mirrors (reflectivity <span class="inline-formula">=0.999963</span> at 450 nm), and a grating spectrometer to determine optical extinction coefficients between 430 and 476 nm, which are fit with custom spectral fitting software and published absorption cross sections. The instrument weighs 3.05 kg and has a power consumption of less than 35 W at 25 <span class="inline-formula">^∘</span>C. …”
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Zn $$_{1-x}$$ 1 - x Ni $$_x$$ x Te semiconductor nanocrystals in transparent glass for optoelectronic device applications by Radha Mada, Hamid Darabian, Seshadri Meruva, Maria José V. Bell, Alessandra S. Silva, Noélio O. Dantas, Virgílio C. Anjos

“…Abstract Doping glass with semiconductors, particularly with nanostructured semiconductors, has attracted attention due to the large optical absorption cross-sections of the latter. Based on this property, Ni $$^{2+}$$ 2 + (5 wt%) doped phosphate glass and Zn $$_{1-x}$$ 1 - x Ni $$_x$$ x Te (x = 0.5, 1.0, 5.0 and 10.0 wt% of Ni $$^{2+}$$ 2 + ) nanocrystals (NCs) doped phosphate glasses (GCs) were prepared by fusion method and subsequent heat treatment. …”
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Impacts of biomass burning and photochemical processing on the light absorption of brown carbon in the southeastern Tibetan Plateau by J. Tian, J. Tian, Q. Wang, Q. Wang, Y. Ma, J. Wang, Y. Han, Y. Han, J. Cao, J. Cao

“…Combined with the light absorption coefficient of BrC (<span class="inline-formula"><i>b</i>_abs-BrC</span>), the source-specific mass absorption cross sections of BBOA (0.61–2.78 m<span class="inline-formula">²</span> g<span class="inline-formula">⁻¹</span>) and po-OOA (0.30–1.43 m<span class="inline-formula">²</span> g<span class="inline-formula">⁻¹</span>) at 370–660 nm were retrieved. …”
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Carbon-semiconductor hybrid nanostructures and their photoresponse behaviors by Zhan, Zhaoyao

“…Semiconductor nanoparticles have large optical absorption cross-sections and tenable electronic properties. …”
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The impact of atmospheric motions on source-specific black carbon and the induced direct radiative effects over a river-valley region by H. Liu, Q. Wang, Q. Wang, Q. Wang, S. Liu, S. Liu, B. Zhou, Y. Qu, J. Tian, T. Zhang, Y. Han, Y. Han, Y. Han, J. Cao

“…Equivalent BC (<span class="inline-formula"><i>e</i></span>BC) source apportionment was based on an aethalometer model with the site-dependent absorption Ångström exponents (AAEs) and the mass absorption cross sections (MACs) retrieved using a positive matrix factorization (PMF) model based on observed chemical components (i.e., EC, POC, K<span class="inline-formula">⁺</span>, Mg, Al, Si, S, Cl, Ca, V, Mn, Fe, Ni, Cu, As, Se, Br, Sr, Pb, Ga, and Zn) and primary absorption coefficients at selected wavelengths from <span class="inline-formula"><i>λ</i>=370</span> to 880 nm. …”
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High resolution diode laser spectroscopy of transient species by Crow, MB

“…The application of the UV radiation source to spectroscopy of the <em>A</em>¹<em>A</em>₂ − <em>X</em>¹<em>A</em>₁ electronic band of formaldehyde is explored, where absolute absorption cross sections are determined for rotational transitions within the 220410 and 220430 vibronic bands. …”

Tailoring Plasmonic Nanoheaters Size for Enhanced Theranostic Agent Performance by Túlio de L. Pedrosa, Gabrielli M. F. de Oliveira, Arthur C. M. V. Pereira, Mariana J. B. da S. Crispim, Luzia A. da Silva, Marcilene S. da Silva, Ivone A. de Souza, Ana M. M. de A. Melo, Anderson S. L. Gomes, Renato E. de Araujo

“…The photoacoustic images indicate that, despite having larger absorption cross-sections, the large nanoparticle volume of bigger particles leads to less efficient conversion of light into heat, which suggests that the use of optimized nanoparticles promotes higher contrast, benefiting photoacoustic-based procedures in diagnostic applications. …”
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Towards electrically injected colloidal semiconductor lasers by Thung, Yi Tian

“…Their advantages of excellent solution processability, large absorption cross-sections, narrow full-width-half-maximum, flexible wavelength tunability, and reduced Auger effects make them promising gain media for next-generation lasing. …”
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Cavity ring-down spectroscopy of water vapor in the deep-blue region by Q.-Y. Yang, E. K. Conway, E. K. Conway, H. Liang, I. E. Gordon, Y. Tan, S.-M. Hu

“…Water vapor absorption cross-sections near 415 nm were calculated based on our measurements, which vary between <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M4" display="inline" overflow="scroll" dspmath="mathml"><mrow><mn mathvariant="normal">1</mn><mo>×</mo><msup><mn mathvariant="normal">10</mn><mrow><mo>-</mo><mn mathvariant="normal">26</mn></mrow></msup></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="46pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="823788eb5459392264cc86b448083401"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="amt-15-4463-2022-ie00003.svg" width="46pt" height="14pt" src="amt-15-4463-2022-ie00003.png"/></svg:svg></span></span> and <span class="inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" id="M5" display="inline" overflow="scroll" dspmath="mathml"><mrow><mn mathvariant="normal">5</mn><mo>×</mo><msup><mn mathvariant="normal">10</mn><mrow><mo>-</mo><mn mathvariant="normal">26</mn></mrow></msup><mspace width="0.125em" linebreak="nobreak"/></mrow></math><span><svg:svg xmlns:svg="http://www.w3.org/2000/svg" width="46pt" height="14pt" class="svg-formula" dspmath="mathimg" md5hash="dcb7879aba430720fcd959e413aa9198"><svg:image xmlns:xlink="http://www.w3.org/1999/xlink" xlink:href="amt-15-4463-2022-ie00004.svg" width="46pt" height="14pt" src="amt-15-4463-2022-ie00004.png"/></svg:svg></span></span>cm<span class="inline-formula">²</span> molec.…”
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Applications of infrared laser spectroscopy to breath analysis by Cummings, B

“…The move of spectroscopic detection to the MIR exploits the larger absorption cross-sections available in this region, and to achieve this, a relatively new form of semiconductor laser, the quantum cascade laser (QCL) is used. …”

Evaluation of the methane full-physics retrieval applied to TROPOMI ocean sun glint measurements by A. Lorente, T. Borsdorff, M. C. Martinez-Velarte, A. Butz, A. Butz, O. P. Hasekamp, L. Wu, J. Landgraf

“…Using the “upper-edge” method, we identify a set of ocean glint observations where scattering by aerosols and clouds can be ignored in the measurement simulation to investigate other possible error sources such as instrumental errors, radiometric inaccuracies or uncertainties related to spectroscopic absorption cross-sections. With this ensemble we evaluate the RemoTeC forward model via the validation of the total atmospheric oxygen (O<span class="inline-formula">₂</span>) column retrieved from the O<span class="inline-formula">₂</span> A-band, as well as the consistency of <span class="inline-formula">XCH₄</span> retrievals using sub-bands from the SWIR band, which show a consistency within 1 %. …”
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Atmospheric oxidation of new “green” solvents – Part 2: methyl pivalate and pinacolone by C. Mapelli, C. Mapelli, J. K. Donnelly, Ú. E. Hogan, Ú. E. Hogan, A. R. Rickard, A. R. Rickard, A. T. Robinson, F. Byrne, F. Byrne, C. R. McElroy, C. R. McElroy, B. F. E. Curchod, D. Hollas, T. J. Dillon

“…</p> <p>UV–Vis spectroscopy experiments and computational calculations were used to explore cross-sections for <span class="inline-formula">(CH₃)₃</span><span class="inline-formula">CC(O)CH₃</span> photolysis (Reaction R4), while <span class="inline-formula">(CH₃)₃</span><span class="inline-formula">CC(O)OCH₃</span> showed no sign of absorption over the wavelengths of interest. Absorption cross-sections for <span class="inline-formula">(CH₃)₃</span><span class="inline-formula">CC(O)CH₃</span>, <span class="inline-formula"><i>σ</i>₄(<i>λ</i>)</span>, in the actinic region were larger, and the maximum was red-shifted compared to estimates (methyl ethyl ketone (MEK) values) used in current state-of-science models. …”
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Photolysis and oxidation by OH radicals of two carbonyl nitrates: 4-nitrooxy-2-butanone and 5-nitrooxy-2-pentanone by B. Picquet-Varrault, R. Suarez-Bertoa, M. Duncianu, M. Cazaunau, E. Pangui, M. David, J.-F. Doussin

“…They also suggest that, similarly to <span class="inline-formula"><i>α</i></span>-nitrooxy ketones, <span class="inline-formula"><i>β</i></span>-nitrooxy ketones have enhanced UV absorption cross sections and quantum yields equal to or close to unity and that <span class="inline-formula"><i>γ</i></span>-nitrooxy ketones have a lower enhancement of cross sections, which can easily be explained by the larger distance between the two chromophore groups. …”
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