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1. Ultraviolet hyperspectral interferometric microscopy

   https://doi.org/10.1117/12.2511967  

   Robles, Francisco E.; Wax, Adam; Backman, Vadim (March 2019, Biophysics, Biology and Biophotonics IV: the Crossroads)
2. Ultraviolet Hyperspectral Interferometric Microscopy

   https://doi.org/10.1038/s41598-018-28208-0  

   Ojaghi, Ashkan; Fay, Meredith E.; Lam, Wilbur A.; Robles, Francisco E. (July 2018, Scientific Reports)

   Abstract Ultraviolet (UV) spectroscopy is a powerful tool for quantitative (bio)chemical analysis, but its application to molecular imaging and microscopy has been limited. Here we introduce ultraviolet hyperspectral interferometric (UHI) microscopy, which leverages coherent detection of optical fields to overcome significant challenges associated with UV spectroscopy when applied to molecular imaging. We demonstrate that this method enables quantitative spectral analysis of important endogenous biomolecules with subcellular spatial resolution and sensitivity to nanometer-scaled structures for label-free molecular imaging of live cells. 

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3. Ultra-diffuse Galaxies at Ultraviolet Wavelengths

   https://doi.org/10.3847/1538-3881/ab16f2  

   Singh, Pranjal Rajendra; Zaritsky, Dennis; Donnerstein, Richard; Spekkens, Kristine (May 2019, The Astronomical Journal)
4. Ultraviolet photodissociation of 2-methylallyl radical

   https://doi.org/10.1063/1674-0068/cjcp2309088  

   Lucas, Michael; Qin, Yuan; Chen, Min; Sun, Ge; Zhang, Jingsong (April 2024, Chinese Journal of Chemical Physics)

   Ultraviolet photodissociation dynamics of 2-methylallyl radical from the 3p Rydberg state were investigated in the wavelength region of 226–244 nm using the high-n Rydberg atom time-of-flight (HRTOF) technique. The 2-methylallyl radicals were generated by 193 nm photolysis of 3-chloro-2-methyl-1-propene precursors. The photofragment yield spectrum of H-atom products increases in intensity with decreasing wavelengths in 226–244 nm. The TOF spectra of H-atom products show a bimodal structure. The predominant product channel (with ∼98% branching ratio) has a kinetic energy release peaking at ∼7 kcal/mol, with an average ratio of ET in the total available energy, (fT), of ∼0.18 in 226–244 nm and an isotropic product angular distribution. At the low ET, isotropic component is from statistical unimolecular decomposition of highly vibrationally excited hot 2-methylallyl to the methylenecyclopropane+H products, following internal conversion from the excited electronic state. The minor product channel (with ∼2% branching ratio) has a large kinetic energy peaking at ∼50 kcal/mol, with (fT)≈0.63 and an anisotropic angular distribution (β≈−0.2). At the high ET, anisotropic component is non-statistical and is postulated to be from direct loss of H atom via the 3p Rydberg state or repulsive part of the ground state to the 1,3-butadiene+H products. 

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5. Single‐Shot Ultraviolet Compressed Ultrafast Photography

   https://doi.org/10.1002/lpor.202000122  

   Lai, Yingming; Xue, Yujia; Côté, Christian‐Yves; Liu, Xianglei; Laramée, Antoine; Jaouen, Nicolas; Légaré, François; Tian, Lei; Liang, Jinyang (September 2020, Laser & Photonics Reviews)

   Abstract Compressed ultrafast photography (CUP) is an emerging potent technique that allows imaging a nonrepeatable or difficult‐to‐produce transient event in a single shot. Despite many recent advances, existing CUP techniques operate only at visible and near‐infrared wavelengths. In addition, spatial encoding via a digital micromirror device (DMD) in CUP systems often limits its field of view and imaging speeds. Finally, conventional reconstruction algorithms have limited control of the reconstruction process to further improve the image quality in the recovered datacubes of the scene. To overcome these limitations, this article reports a single‐shot UV‐CUP that exhibits a sequence depth of up to 1500 frames with a size of 1750 × 500 pixels at an imaging speed of 0.5 trillion frames per second. A patterned photocathode is integrated into a streak camera, which overcomes the previous restrictions in DMD‐based spatial encoding and improves the system's compactness. Meanwhile, the plug‐and‐play alternating direction method of multipliers algorithm is implemented to CUP's image reconstruction to enhance reconstructed image quality. UV‐CUP's single‐shot ultrafast imaging ability is demonstrated by recording UV pulses transmitting through various spatial patterns. UV‐CUP is expected to find many applications in both fundamental and applied science. 

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