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Wang, Jie; Meng, Qingnan; Mo, Yuxiang

doi:10.1103/physrevlett.119.053002

Cited by 15 publications

(5 citation statements)

References 22 publications

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“…Interestingly, in many measurements the observed probability density function (PDF), P (X, t), attains an exponential (or close to exponential) decay. Examples include colloidal suspensions [3,4], nano particles in polymer solutions [5], molecular motion on a solid-liquid interface [6,7], living cells [8], phospholipid fluid tubules and biofilament networks [9,10], active gels [11], financial markets [12], colloidal glasses [13,14], worms [15] and suspensions of swimming microorganisms [16,17] (more examples are provided in [9,18]).…”

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confidence: 99%

Packets of Diffusing Particles Exhibit Universal Exponential Tails

2020

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Brownian motion is a Gaussian process described by the central limit theorem. However, exponential decays of the positional probability density function P (X, t) of packets of spreading random walkers, were observed in numerous situations that include glasses, live cells and bacteria suspensions. We show that such exponential behavior is generally valid in a large class of problems of transport in random media. By extending the Large Deviations approach for a continuous time random walk we uncover a general universal behavior for the decay of the density. It is found that fluctuations in the number of steps of the random walker, performed at finite time, lead to exponential decay (with logarithmic corrections) of P (X, t). This universal behavior holds also for short times, a fact that makes experimental observations readily achievable. *

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confidence: 99%

Packets of Diffusing Particles Exhibit Universal Exponential Tails

2020

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“…The 2 pσB state correlates to the channel D(1s) + D(2p). Therefore, the nonadiabatic interaction along the dissociation path determines the channel branching ratio [D(2s)]/[D(2s) + D(Hp)]. − For dissociation near the threshold, the phase of the wave functions between the two channels plays an important role in determining the branching ratios. − …”

Section: Resultsmentioning

confidence: 99%

Spectra and Predissociation Dynamics of the 4pσB′′¹∑_u⁺ and 4pπD′ ¹Π_u States of D₂

Wang

2022

J. Phys. Chem. A

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The spectra and predissociation dynamics of the Rydberg states 4pσB″ 1 ∑ u + (υ′=2) and 4pπD′ 1 Π u ± (υ′=1) of the D 2 molecule have been studied by a combination of XUV laser pump, UV laser probe, and velocity map imaging methods. The D(2l) fragment yield spectrum and the D 2 excitation spectrum have been measured. Although the predissociation rates were found to be small and comparable to the radiative decay rates, the D(2l) fragments were observed for all the Rydberg states. The measured D(2l) fragment angular distributions are in good agreement with a reported model that has an analytical formula for anisotropy parameters. The results demonstrated that the 4pσB″ 1 ∑ u + and 4pπD′ 1 Π u + states dissociate via direct and indirect coupling with an 1 ∑ u + state, respectively. For predissociation of the 4pσB″ 1 ∑ u + state, the experimental data showed that D(1s) + D(2s) is the main channel, supporting previous theoretical predictions that the predissociation occurs by coupling to the vibrational continuum of the 3pσB′ 1 ∑ u + state.

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“…Besides the normal electronic predissociation process, tunneling predissociation also plays an important role for the 2pπC 1 Π ± u (v=19) state, especially for the f-parity levels for which tunneling is the only predissociation channel as required by the symmetry. Besides excitation to bound levels for which predissociation process usually happens following the photon absorption, Mo and coworkers have also excited D 2 molecules to the vibrational continua associated with the 3pσB ′1 Σ + u and 2pσB 1 Σ + u states which are correlated with the dissociation channels D(1s)+D(2s) and D(1s)+D(2p), respectively [21]. The branching ratios between the two channels have been measured from the dissociation threshold to 3200 cm −1 above it, and they show cosine oscillations as a function of the excitation photon energy, as shown in FIG.…”

Section: A H 2 (D 2 Hd)mentioning

confidence: 99%

“…Many spectroscopic investigations have been performed to measure The photon energies for the measured branching ratios are set at the flat region of the fragment yield spectrum which corresponds to the vibrational continua of the 3pσB ′1 Σ + u and 2pσB 1 Σ + u states. The experimental results are for the R(0) transitions (p-wave), and the theoretical results are for the P(1) transitions (s-wave) [21]. Reprinted with permission from Ref.…”

Section: B Comentioning

confidence: 99%

Quantum state-to-state vacuum ultraviolet photodissociation dynamics of small molecules

Gao

2019

Chinese Journal of Chemical Physics

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The present review focused on selected, recent experimental progress of photodissociation dynamics of small molecules covering the vacuum ultraviolet (VUV) range from 6 eV to 20 eV. These advancements come about due to the available laser based VUV light sources, along with the developments of advanced experimental techniques, including the velocitymap imaging (VMI), H-atom Rydberg tagging time-of-flight (HRTOF) techniques, as well as the two-color tunable VUV-VUV laser pump-probe detection method. The applications of these experimental techniques have allowed VUV photodissociation studies of many diatomic and triatomic molecules to quantum state-to-state in detail. To highlight the recent accomplishments, we have summarized the results on several important molecular species, including H 2 (D 2 , HD), CO, N 2 , NO, O 2 , H 2 O (D 2 O, HOD), CO 2 , and N 2 O. The detailed VUV photodissociation studies of these molecules are of astrochemical and atmospheric relevance. Since molecular photodissociation initiated by VUV excitation is complex and is often governed by multiple electronic potential energy surfaces, the unraveling of the complex dissociation dynamics requires state-to-state cross section measurements. The newly constructed Dalian Coherent Light Source (DCLS), which is capable of generating coherent VUV radiation with unprecedented brightness in the range of 50−150 nm, promises to propel the photodissociation experiment to the next level.

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Oscillation of Branching Ratios Between the D(2s)+D(1s) and the
Jie Wang
¹
,
Qingnan Meng
²
,
Yuxiang Mo
³

Cited by 15 publications

References 22 publications

Packets of Diffusing Particles Exhibit Universal Exponential Tails

Packets of Diffusing Particles Exhibit Universal Exponential Tails

Spectra and Predissociation Dynamics of the 4pσB′′¹∑_u⁺ and 4pπD′ ¹Π_u States of D₂

Quantum state-to-state vacuum ultraviolet photodissociation dynamics of small molecules

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Oscillation of Branching Ratios Between the D(2s)+D(1s) and the Jie Wang1, Qingnan Meng2, Yuxiang Mo3

Cited by 15 publications

References 22 publications

Packets of Diffusing Particles Exhibit Universal Exponential Tails

Packets of Diffusing Particles Exhibit Universal Exponential Tails

Spectra and Predissociation Dynamics of the 4pσB′′1∑u+ and 4pπD′ 1Πu States of D2

Quantum state-to-state vacuum ultraviolet photodissociation dynamics of small molecules

Contact Info

Product

Resources

About

Oscillation of Branching Ratios Between the D(2s)+D(1s) and the
Jie Wang
¹
,
Qingnan Meng
²
,
Yuxiang Mo
³

Spectra and Predissociation Dynamics of the 4pσB′′¹∑_u⁺ and 4pπD′ ¹Π_u States of D₂