There are substantial instruction videos on the Internet, which enables us to acquire knowledge for completing various tasks. However, most existing datasets video analysis have limitations in diversity and scale, makes them far from many real-world applications where more diverse activities occur. Moreover, it still remains a great challenge organize harness such data. To address these problems, we introduce large-scale dataset called "COIN" COmprehensive INstruction analysis. Organized...

We report the experimental observation of double intermolecular Coulombic decay (dICD) and reveal its potential for radiation biology in some prototypical molecular dimers consisting benzene, pyridine, water. In dICD, inner-shell vacancy is filled by an electron from outer shell energy released transferred to doubly ionize neighboring molecule with emission two low-energy electrons. The system further relaxes a three-body Coulomb explosion process, e.g., CH3++C5H3++C6H6+ benzene dimer....

Abstract Two molecules, 1-hydroxypyrene-2-carbaldehyde (HP) and 1-methoxypyrene-2-carbaldehyde (MP) were explored. We investigated their photophysical properties, using experimental transient absorption theoretical density functional theory/time-dependent theory (DFT/TDDFT). HP MP have similar geometric conformations but exhibit entirely different properties upon excitation into the S 1 state. In contrast to traditional excited state intramolecular proton transfer (ESIPT) in molecules that...

The twisted intramolecular charge transfer (TICT) state plays an important role in determining the performance of optoelectronic devices. However, for some nonfluorescent TICT molecules, "invisible" could only be visualized by modifying molecular structure. Here, we introduce a new facile pressure-induced approach to light up through use pressure-related liquid-solid phase transition surrounding solvent. Combining ultrafast spectroscopy and quantum chemical calculations, it reveals that can...

Abstract We investigated the ionization and dissociation processes of ammonia clusters ranging from dimer to pentamer induced by 800 nm femtosecond laser fields. Time-of-flight (TOF) mass spectra were recorded over a range intensities 2.1 × 10 12 5.6 W/cm 2 . The protonated ion signals dominate spectra, which is consistent with stability geometric structures. channels are discussed. competition switching among observed revealed analyzing variations in relative ionic yields specific...

The multiple proton transfer reactions of 3-hydroxypyridine-(H₂O)₃have been demonstrated, and a perfect cycle has revealed in the ground excited states.

Photonic crystals incorporating with plasmonic nanoparticles have recently attracted considerable attention due to their novel optical properties and potential applications in future subwavelength optics, biosensing data storage device. Here we demonstrate a free-standing chiral film composed of entropy-driven self-co-assembly gold (GNPs) rod-like cellulose nanocrystals (CNCs). The CNCs–GNPs composite films not only preserve the photonic ordering CNCs matrix but also retain resonance GNPs,...

The effect of hydrogen bonding on the intermolecular photoinduced ICT and TICT processes for coumarin 500 has been demonstrated, a reliable mechanism revealed to explain unusual behavior C500 in dioxane methanol.

Ultrafast carrier relaxation dynamics in fluorescent carbon nanodots is investigated by femtosecond transient absorption spectra at different pH environments so as to understand the mechanism of fluorescence for first time. Utilizing multi-wavelength global analysis fit measured signal via a sequential model, four channels are found, which attributed electron-electron scattering and surface state trapping, optical phonon scattering, acoustic electron-hole recombination respectively. The...

It is generally believed that the bandgap of graphene oxide proportional to concentration oxygen atoms and a highly reduced (rGO) without vacancy defects should be gapless. We show here from first principles calculations can effectively opened even in low oxidation level with absorption either symmetrically or asymmetrically. The properly arranged induce up 1.19 eV for C/O ratio 16/1 symmetric system 1.58 32/3 an asymmetric system, at generalized gradient approximation (GGA) level....

Abstract Intermolecular interactions involving aromatic rings are ubiquitous in biochemistry and they govern the properties of many organic materials. Nevertheless, our understanding structures dynamics clusters remains incomplete, particular for systems beyond dimers, despite their high presence macromolecular such as DNA proteins. Here, we study fragmentation benzene trimer that represents a prototype higher-order clusters. The trimers initially ionized by electron-collision with creation...

Road conditions can provide important information for driving safety in assistance system. The input images usually include unnecessary and road need to be analyzed only a region of interest (ROI) reduce the amount computation. In this paper, vision-based ROI determination algorithm is proposed detect using positional vanishing point line segments. segments are detected Hough Transform. determined automatically adaptively every frame. method applied various video from black boxes, verified robust.

Rydberg-state excitation of atoms in strong infrared laser fields provides a new complementary aspect the perspective atom--strong field interactions. In this article, we perform an experimental and theoretical study on corresponding process diatomic molecules, ${\mathrm{N}}_{2}$ ${\mathrm{O}}_{2}$. We show that neutral molecules can also survive 800-nm high Rydberg states, while their behavior is remarkably different comparison with companion atoms, Ar Xe. The generally behaves similarly to...

We have measured the angular distributions of high energy photoelectrons benzene molecules generated by intense infrared femtosecond laser pulses. These electrons arise from elastic collisions between ions with previously tunnel-ionized that been driven back field. Theory shows laser-free differential cross sections (DCSs) can be extracted these photoelectrons, and DCS used to retrieve bond lengths gas-phase similar conventional electron diffraction method. From our experimental results, we...

Electron transfer (ET) and Auger recombination (AR) processes in quantum dots (QDs) are key mechanisms for the advance of QD-based devices. However, it still remains a challenge to promote ET suppress AR simultaneously. Here, we use situ high-pressure ultrafast transient absorption spectroscopy explore impact pressure on between CdSe/ZnS anthraquinone (AQ) dissolved cyclohexane. Remarkably, under compression, lifetimes shorten, while suppression is present. The promotion attributed shortened...

Investigation on structures in the high-harmonic spectrum has provided profuse information of molecular structure and dynamics intense laser fields, based which techniques ultrafast imaging have been developed. Combining ab initio calculations experimental measurements CO_{2} molecule, we find a novel dip low-energy region harmonic is identified as fingerprints participation deeper-lying orbitals process decodes underlying attosecond multichannel coupling dynamics. Our work sheds new light...

This study investigates the ultrafast fragmentation of ammonia clusters, ${({\mathrm{NH}}_{3})}_{n}$ ($n=2$, 3, and 4), by using ion-ion multibody coincidence measurements after interaction with a strong femtosecond laser. Specifically, Coulomb explosion proton transfer channels in dimer, as well tri- tetramers, are assigned. The kinetic energy release distributions Newton plots each channel extracted analyzed. To gain further insights into dissociation process, an ab initio molecular...

The excited-state carrier dynamics of lead halide perovskites play a critical role in their photoelectric properties, and are greatly affected by lattice structural changes. In this work, the all-inorganic CsPbBr3 peroveskite, as function pressure, investigated using situ high-pressure femtosecond transient absorption spectroscopic experiments. Compression is found to drive crystal evolution, thereby markedly changing behavior charge carriers CsPbBr3. Before phase transition, simultaneous...

How the neighbor effect plays its role in fragmentation of molecular clusters attracts great attention for physicists and chemists. Here, we study this N_{2}O dimer by performing three-body coincidence measurements on femtosecond timescale. Rotations bound N_{2}O^{+} triggered neutral or ionic neighbors are tracked. The forbidden dissociation path between B^{2}Π ^{4}Π is opened spin-exchange due to existence ions, leading a new channel N_{2}O^{+}→NO+N^{+} originating from B^{2}Π. formation...

Abstract We propose a geometric optical model that describes real-image formation via monocular vision in three dimensions. only assume the ganglion cell nuclei, bipolar and photoreceptor nuclei human retina can be treated as microlenses actively participate imaging. In particular, we suggest operates an array of high-magnification micro-real-image telescopes oriented various azimuthal directions. The main elements each telescope are following. first is cornea crystalline lens, which serve...