## Search

Now showing items 1-10 of 17

#### Tunnelling times, Larmor clock, and the elephant in the room

(2021-05-11)

A controversy surrounding the “tunnelling time problem” stems from the seeming inability of quantum mechanics to provide, in the usual way, a definition of the duration a particle is supposed to spend in a given region of ...

#### An optimal scaling to computationally tractable dimensionless models: Study of latex particles morphology formation

(2020-02)

In modelling of chemical, physical or biological systems it may occur that the coefficients, multiplying various terms in the equation of interest, differ greatly in magnitude, if a particular system of units is used. Such ...

#### No Time at the End of the Tunnel

(2018-08-21)

Modern atto-second experiments seek to provide an insight into a long standing question: “how much time does a tunnelling particle spend in the barrier?” Traditionally, quantum theory relates this duration to the delay ...

#### An even simpler understanding of quantum weak values

(2018-01)

We explain the properties and clarify the meaning of quantum weak values using only the basic notions of elementary quantum mechanics.

#### Reexamination of continuous fuzzy measurement on two-level systems

(2017-04-10)

Imposing restrictions on the Feynman paths of the monitored system has in the past been proposed as a universal model-free approach to continuous quantum measurements. Here we revisit this proposition and demonstrate that ...

#### Complex angular momentum theory of state-to-state integral cross sections: Resonance effects in the $F + HD \to HF(v' = 3) + D$ reaction

(2015-12-31)

State-to-state reactive integral cross sections (ICSs) are often affected by quantum mechanical resonances, especially near a reactive threshold. An ICS is usually obtained by summing partial waves at a given value of ...

#### Non-Markovian models of the growth of a polymer chain

(2015-12-31)

Using simple exactly solvable models, we show that event-dependent time delays may lead to significant non-Poisson effects in the statistics of polymer chain growth. The results are confirmed by stochastic simulation of ...

#### Relative frequencies of constrained events in stochastic processes: An analytical approach

(2015-12-31)

The stochastic simulation algorithm (SSA) and the corresponding Monte Carlo (MC) method are among the most common approaches for studying stochastic processes. They relies on knowledge of interevent probability density ...

#### Computer software for understanding resonances and resonance-related phenomena in chemical reactions

(2014-12-31)

In numerical modelling of chemical reactions one calculates the scattering matrix for the required values of energy and angular momentum. Having done so, one still faces the non-trivial task of extracting detailed information ...

#### Numerical Regge pole analysis of resonance structures in elastic, inelastic and reactive state-to-state integral cross sections

(2014-12-31)

We present a detailed description of a FORTRAN code for evaluation of the resonance contribution a Regge trajectory makes to the integral state-to-state cross section (ICS) within a specified range of energies. The ...