Article
Chemistry, Analytical
Wuyi Nie, Qiao Lu, Tao Hu, Min Xie, Yongjun Hu
Summary: This article visualized the distribution of curcumin in turmeric using vacuum-ultraviolet single photon postionization mass spectrometric imaging. The concentration of curcumin was found to decrease from the phloem to the xylem of the root. The study also analyzed the transformation of curcumin in turmeric roots at different maturity periods.
Article
Physics, Multidisciplinary
Gabriel A. Stewart, Paul Hoerner, Duke A. Debrah, Suk Kyoung Lee, H. Bernhard Schlegel, Wen Li
Summary: A phase-resolved two-electron-angular-streaking method is developed to investigate the spatial evolution of an ultrafast spin-orbit wave packet in the krypton cation and the motion of a faster wave packet in the xenon cation. The refilling of an electronic hole is observed 1.2 fs after its production, and the filling occurs on the opposite side of the hole's birth.
PHYSICAL REVIEW LETTERS
(2023)
Article
Optics
Weifeng Yang, Jie Li, Wenbin Jia, Hongdan Zhang, Xiwang Liu, Ming Zhu, Xiaohong Song, Jing Chen
Summary: The study utilized an improved quantum trajectory Monte Carlo method to investigate the low-energy interference structure in the photoelectron momentum distribution of xenon atoms subjected to an intense laser field. It found that the Stark shift plays a crucial role in the formation of this structure, moving the constructive interference to lower momentum regions. This research offers insight into electron dynamics of atoms and molecules under intense laser fields.
Article
Chemistry, Physical
Dror M. Bittner, Krishnendu Gope, Ester Livshits, Roi Baer, Daniel Strasser
Summary: In this study, the competing mechanisms involved in the Coulomb explosion of 2-propanol (CH3)(2)CHOH2+ dication formed by an ultrafast extreme ultraviolet pulse were investigated. Over 20 product channels were identified and characterized using 3D coincidence imaging of the ionic fragments. The results indicate a dominant sequential mechanism involving the cleavage of a C-C bond and secondary fragmentation of the hydroxyethyl cation, while C-O bond dissociation channels were less frequent. Exotic structural rearrangements were also observed. The relative yield of H3+ product was found to be suppressed compared to methanol and alkene dications.
JOURNAL OF CHEMICAL PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Fenghao Sun, Hui Li, Shanshan Song, Fei Chen, Jiawei Wang, Qiwen Qu, Chenxu Lu, Hongcheng Ni, Botao Wu, Hongxing Xu, Jian Wu
Summary: This study used the single-shot velocity map imaging technique to observe the explosion imaging of different ion species ejected from 50 nm SiO2 nanoparticles excited by strong near-infrared and ultraviolet femtosecond laser fields. The results showed forward emission of ions at low excitation intensities and shockwave behaviors at high intensities. When the excitation intensity approached the dissociative ionization threshold, the resulting ion products could be used to image the instant near-field distributions.
Article
Instruments & Instrumentation
Jinyou Long, Ziheng Qiu, Jie Wei, Duoduo Li, Xinli Song, Bing Jin, Bing Zhang
Summary: A new liquid-microjet photoelectron imaging (PEI) spectrometer has been constructed, combining liquid-microjet technique with velocity-map imaging to measure energy and angular distributions of photoelectrons from volatile liquid solutions. The spectrometer's capability has been demonstrated by recording the photoelectron image of aqueous 2-furfural, marking the first successful PEI of liquid aqueous solutions.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2021)
Article
Chemistry, Physical
Ashish Jain, Jean-Luc Begin, Ravi Bhardwaj
Summary: A novel chiroptical sensing technique using the helical phase of structured light as a chiral reagent was introduced. This technique can differentiate enantiopure chiral liquids by their differential absorbance of helical light, which is significantly higher compared to conventional linear techniques. The origin of the helicity dependent absorption is explained in terms of induced multipole moments in nonlinear light-matter interaction, opening up possibilities for using helical light as a primary chiral reagent in nonlinear spectroscopic techniques.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Physics, Multidisciplinary
Ihar Babushkin, Alvaro Jimenez Galan, Jose Ricardo Cardoso de Andrade, Anton Husakou, Felipe Morales, Martin Kretschmar, Tamas Nagy, Virgilijus Vaicaitis, Liping Shi, David Zuber, Luc Berge, Stefan Skupin, Irina A. Nikolaeva, Nikolay A. Panov, Daniil E. Shipilo, Olga G. Kosareva, Adrian N. Pfeiffer, Ayhan Demircan, Mark J. J. Vrakking, Uwe Morgner, Misha Ivanov
Summary: This paper discusses the possible time delay of electron tunnelling from an atom and presents an all-optical method to study this phenomenon. The research shows that the tunnelling wavepacket undergoes reshaping as it emerges from the tunnelling barrier and moves away from the core, and this can be complemented by measuring the Brunel radiation emitted by the tunnelling electrons.
Article
Chemistry, Physical
Dhirendra P. Singh, James O. F. Thompson, Katharine L. Reid, Ivan Powis
Summary: The study conducted photoelectron circular dichroism analysis of S-(+)-fenchone enantiomers using picosecond laser, revealing complex vibronic dynamics of the 3p -> 3s internal conversion and large variations in chiral asymmetry factors.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Physics, Multidisciplinary
Shinsuke Haze, Jose P. D'Incao, Dominik Dorer, Markus Deiss, Eberhard Tiemann, Paul S. Julienne, Johannes Hecker Denschlag
Summary: We explore the physical origin and general validity of a propensity rule for the conservation of hyperfine spin state in three-body recombination. By testing the rule on Rb-85, which has different scattering properties from Rb-87, we observe that the rule also holds for Rb-85. Through experimental observations and theoretical analysis, we gain understanding of the conservation of hyperfine spin state and identify criteria to judge its applicability to other elements and collision channels.
PHYSICAL REVIEW LETTERS
(2022)
Article
Chemistry, Analytical
Chaohong Gao, Yubing Wang, Heng Zhang, Wei Hang
Summary: Titania nanosheets are used as novel substrates for simultaneous analysis and imaging of low-mass molecules and lipid species. The TiO2 NS-assisted LDI mass spectrometry method shows higher sensitivity and less spectral interference compared to conventional matrices and substrates. It also allows for the determination of blood glucose levels in mouse serum and visualization of spatial distributions of small molecules and lipid species in mouse brain tissue.
ANALYTICAL CHEMISTRY
(2023)
Article
Optics
Peng Qin, Xufei Sun, Yunquan Liu, Zhanghai Chen
Summary: Using a semiclassical quantum-trajectory Monte Carlo model, this study comprehensively investigates the previously overlooked strong-field photoelectron holographic pattern called the spiral, shedding light on the interference mechanism of forward and backward rescattering trajectories and identifying key factors for the spiral formation.
Article
Optics
Jia-He Chen, Shuai Ben, Qi Zhen, Yue Sun, Xue-Shen Liu
Summary: We investigate the photoelectron momentum distribution of He atoms by solving the time-dependent Schrodinger equation numerically. By changing the relative phase, the directionality and interference structure in the photoelectron momentum spectra can be controlled.
Article
Chemistry, Physical
Kennosuke Hoshina, Tatsuro Shirota, Masashi Tsuge
Summary: The study found that mass spectra of n-pentane and n-hexane ionized through femtosecond-laser pulses were measured, and two-body dissociation pathways were identified as side peaks and found to be influenced by different pulse polarization directions.
JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
Article
Multidisciplinary Sciences
D. Trabert, S. Brennecke, K. Fehre, N. Anders, A. Geyer, S. Grundmann, M. S. Schoeffler, L. Ph H. Schmidt, T. Jahnke, R. Doerner, M. Kunitski, S. Eckart
Summary: The study reveals that in the ionization process induced by a strong light field in molecules, the Wigner time delay depends on the emission direction of electrons, and the observed changes can be explained by elongated/shortened travel paths of the emitted electrons.
NATURE COMMUNICATIONS
(2021)
