Pinpointing the role of geometric phase During chemical reactions, electrons usually rearrange more quickly than nuclei. Thus, theorists often adopt an adiabatic framework that considers vibrational and rotational dynamics within single electronic states. Near regime where two states intersect, get complicated, a factor is introduced to maintain simplifying power treatment. Yuan et al. conducted precise experimental measurements validate this approach. They studied elementary H + HD reaction...

Abstract It has long been known that there is a conical intersection (CI) between the ground and first excited electronic state in H 3 system. Its associated geometric phase (GP) effect theoretically predicted to exist below CI since time. However, experimental evidence not established yet its dynamical origin waiting be elucidated. Here we report combined crossed molecular beam quantum reactive scattering dynamics study of H+HD → 2 +D reaction at 2.28 eV, which well CI. The GP clearly...

The effect of electron spin-orbit interactions on chemical reaction dynamics has been a topic much research interest. Here we report combined experimental and theoretical study the spin orbital angular momentum in F + HD → HF D reaction. Using high-resolution imaging technique, observed peculiar horseshoe-shaped pattern product rotational-state-resolved differential cross sections around forward-scattering direction. unusual could only be explained properly by highly accurate quantum theory...

The reaction of electronically excited nitrogen atoms, N(2D), with vinyl cyanide, CH2CHCN, has been investigated under single-collision conditions by the crossed molecular beam (CMB) scattering method mass spectrometric detection and time-of-flight (TOF) analysis at collision energy, Ec, 31.4 kJ/mol. Synergistic electronic structure calculations doublet potential energy surface (PES) have performed to assist in interpretation experimental results characterize overall micromechanism....

A comprehensive understanding of dissociation mechanisms is fundamental importance in the photochemistry small molecules. Here, we investigated detailed photodissociation dynamics H2S+ near 337 nm by using velocity map ion imaging technique together with theoretical characterizations developing global full-dimensional potential energy surfaces (PESs). Rotational state resolved images were acquired for S+(4S) + H2 product channel. Significant changes total kinetic release distributions and...

We report on a combined experimental and theoretical investigation of the N(2D) + CH2CCH2 (allene) reaction relevance in atmospheric chemistry Titan. Experimentally, was investigated (i) under single-collision conditions by crossed molecular beams (CMB) scattering method with mass spectrometric detection time-of-flight analysis at collision energy (Ec) 33 kJ/mol to determine primary products micromechanism (ii) continuous supersonic flow reactor rate constant as function temperature from 50...

We study the photodissociation dynamics of hydrogen sulfide cations (H2S+) using time-sliced velocity map ion imaging (VMI) technique and high-accuracy calculations. High-resolution images S+(4S) products were measured at four photolysis wavelengths 325.158, 325.200, 325.243, 325.307 nm, which correspond to excitation A2A1(0,13,0) K=1 state H2S+. Rotational state-resolved total kinetic energy releases angular distributions have been derived as a function wavelengths. Notably, wavelength...

The reaction of the nitrogen atom (N) in its first electronically excited state (2D) with cyanoacetylene (HC3N) has been investigated under single-collision conditions by using crossed molecular beam method mass spectrometric detection at a collision energy 31 kJ mol−1. With support electronic structure calculations, we found that this proceeds via barrierless addition N(2D) to carbon–carbon triple bond HC3N, followed formation cyclic intermediate adduct HC(N)CCN, which dissociates C(N)CCN +...

High-resolution state-resolved differential cross sections (DCSs) are of great importance in understanding quantum reaction dynamics, and they the most detailed observables that can be experimentally measured. Here we report a synergic crossed molecular beam dynamics study on H + D2 reaction. With time-sliced velocity map ion imaging (VMI) technique near-threshold ionization scheme, acquired product rovibrational DCSs (v = 0, j 0) → HD (v′, j′) D at collision energy 1.42 eV. For products...

We report the study of photodissociation dynamics nitrous oxide in vacuum ultraviolet region, using time-sliced velocity map ion imaging technique. Ion images O(1S0) and O(3P J=2,1,0) products were measured at nine photolysis wavelengths from 142.55 to 148.79 nm. The product channels + N2(X1Σg+) N2(A3Σu+) have been observed. For these dissociation channels, total kinetic energy releases dissociated acquired. With vibrational structures N2 coproducts partially resolved experimental images,...

Excitation of vibration plays an important role in the photodissociation dynamics molecules and ions. Experiments on molecular ions via well-defined excited vibrational states present a formidable challenge, particularly when it comes to selective preparation at combination level. Here, using time-sliced velocity map ion imaging, H2S+ A2A1(v1=1, v2=8, v3=0, K=1) state leading S+(4S) H2 products was investigated. The cations were prepared by multiphoton ionization H2S, followed resonant...

We report the wavelength-dependent photodissociation dynamical characteristics of CO(X¹Σ⁺) + S(¹S₀) channel <italic>via</italic> Rydberg-type transition.

The vacuum ultraviolet photodissociation of OCS via the F 31Π Rydberg states was investigated in range 134–140 nm by means time-sliced velocity map ion imaging technique. images S(1D2) products from CO(X1Σ+)+S(1D2) dissociation channel were acquired at five photolysis wavelengths, corresponding to a series symmetric stretching vibrational excitations OCS(F 31Π, υ1=0–4). total translational energy distributions, populations and angular distributions CO(X1Σ+, υ) coproducts derived. analysis...

We study the H+CH4/CD4→H2/HD+CH3/CD3 reactions using time sliced velocity map ion imaging technique. Ion images of CH3/CD3 products were measured by (2+1) resonance enhanced multi-photon ionization (REMPI) detection method. Besides in ground state, vibrationally excited also observed at two collision energies 0.72 and 1.06 eV. It is shown that angular distribution states gradually vary from backward scattering to sideways as energy increases. Compared tend be more scattered, indicating...

Abstract TRopIcal DEep-sea Neutrino Telescope (TRIDENT) plans to incorporate silicon photomultipliers (SiPMs) with superior time resolution in addition photomultiplier tubes (PMTs) into its detection units, namely hybrid Digital Optical Modules (hDOMs), improve angular resolution. However, the significantly degrades for large-area SiPMs due large detector capacitance, posing significant challenges readout electronics of hDOM. We analyzed influences series and parallel connections when...

In firearm forensic investigations, detecting gunshot residue (GSR) is crucial for linking firearms to suspects and determining firing distance reconstruction. Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-ToF-MS) emerging as a versatile promising technological platform fingerprint analysis. The capability of functionalized particles an advanced dusting powder visualizing latent fingerprints widely recognized. This study aims investigate the feasibility...

The photodissociation dynamics of the hydrogen sulfide cation (H2S+) (X2B1) were investigated using time-sliced velocity map ion imaging technique. S+ (4Su) product images measured at four photolysis wavelengths around 393.70 nm, corresponding to excitation H2S+ A2A1 (0, 8, 0) state. raw and derived total kinetic energy releases (TKERs) spectra exhibited partial rotational resolution for H2 products. A sensitive dependence on wavelength was observed in TKER anisotropy parameters. Within a...

Time-sliced velocity map ion imaging (VMI) experiments were performed to investigate the photodissociation of H2S+X2B1, via excitation A2A1 (0, 11, 0) state. Experimental images S+ (4Su) products recorded near 349.60 nm for K = 1 band, and 344.30 2 band. The derived product total kinetic energy release (TKER) spectra exhibit partially rotationally resolved structures corresponding H2(X1Σg+) co-products. observed state angular distributions both sensitive dependence on photolysis wavelength...

As the simplest neutral triatomic reaction system, H+H2 bimolecular and its isotope variants are critically important for understanding elementary chemical reactions at microscopic level. A high-resolution crossed molecular beams method was used in this work to explore H+HD→H2+D a collision energy of 2.20 eV. The product D atoms were detected using 1+1′ (vacuum ultraviolet laser) D-atom near-threshold ionization technique. Differential cross sections with vibrational rotational state...

By using the 1 + 1' near-threshold ionization velocity map ion imaging technique, state-to-state reactive differential cross sections have been measured for H HD → H2 D reaction. High-resolution images of products, with rotational states co-products clearly resolved, were acquired at collision energies 0.60 and 1.26 eV, respectively. It is found that angular distribution predominantly backward-scattering energy eV. However, where higher, becomes forward-backward-scattering. Notably, both...

Molecular nitrogen (N2) is the main component of atmosphere Titan, while minor constituents include organic molecules, such as methane and higher hydrocarbons [1,2]. Among them, propyne (methylacetilene) has been identified in Voyager IR spectrum Titan since 1981 [3], its structural isomer propadiene (allene), already predicted to be present by photochemical models, only recently via Texas Echelle Cross Spectrograph on NASA Infrared Telescope Facility [4]. Given presence hydrocarbons,...

Cyanopolyynes are a family of carbon-chain molecules that have been detected in numerous objects the interstellar medium (ISM), such as hot cores, star forming regions and cold clouds [1&amp;#8211;4]. The simplest cyanopolyyne, HC3N, has among first organic to be observed ISM [5] up date also HC5N, HC7N, HC9N HC11N [6, 7]. HC3N HC5N abundant solar-type protostars (see for instance recent work on IRAS 16293-2422 by Jaber Al-Edhari et al. [8]). Remarkably, comet C/1995 O1 (Hale-Bopp) and,...