Fano interference in quantum resonances from angle-resolved elastic scattering

@article{Paliwal2021FanoII,
  title={Fano interference in quantum resonances from angle-resolved elastic scattering},
  author={Prerna Paliwal and Alexander Blech and Christiane P. Koch and Edvardas Narevicius},
  journal={Nature Communications},
  year={2021},
  volume={12}
}
Asymmetric spectral line shapes are a hallmark of interference of a quasi-bound state with a continuum of states. Such line shapes are well known for multichannel systems, for example, in photoionization or Feshbach resonances in molecular scattering. On the other hand, in resonant single channel scattering, the signature of such interference may disappear due to the orthogonality of partial waves. Here, we show that probing the angular dependence of the cross section allows us to unveil… 

References

SHOWING 1-10 OF 35 REFERENCES

Determining the nature of quantum resonances by probing elastic and reactive scattering in cold collisions

Two different formation mechanisms, quantum tunnelling and quantum reflection, can be distinguished by measuring and comparing elastic and inelastic scattering, which probe the spatial localization of the resonance wavefunctions.

Influence of shape resonances on the angular dependence of molecular photoionization delays

Almost completely resolved experimental and computational angular dependence of single-photon ionization delays in NO molecules across a shape resonance is reported, relying on synchrotron radiation and time-independent ab initio calculations.

Spectral phase measurement of a Fano resonance using tunable attosecond pulses

Tunable attosecond pulses combined with weak infrared radiation in an interferometric setup are used to measure not only the intensity but also the phase variation of the photoionization amplitude across an autoionization resonance in argon, indicating a new route towards monitoring electron correlations in time.

Lorentz Meets Fano in Spectral Line Shapes: A Universal Phase and Its Laser Control

A universal temporal-phase formalism is introduced, mapping the Fano asymmetry parameter q to a phase ϕ of the time-dependent dipole response function, which uses quantum-phase control to amplify extreme-ultraviolet light resonantly interacting with He atoms.

Resonance effects in elastic cross sections for electron scattering on pyrimidine: Experiment and theory.

As a consequence of superposition of coherent resonant amplitudes with background scattering the B̃(2)B1 shape resonance appears as a peak, a dip, or a step function in the cross sections recorded as a function of energy at different scattering angles and this effect is satisfactorily reproduced by theory.

Fano resonances in nanoscale structures

Modern nanotechnology allows one to scale down various important devices (sensors, chips, fibers, etc.) and thus opens up new horizons for their applications. The efficiency of most of them is based

Extracting phase and amplitude modifications of laser-coupled Fano resonances.

This general approach provides a physical understanding of the laser-induced spectral shift of absorption-line maxima on a sub-laser-cycle time scale as they are ubiquitously observed in attosecond transient-absorption measurements.

The quantum and classical Fano parameter q

The Fano resonance has been a familiar and important feature in atomic and molecular physics for more than half a century. Typically, the combination of a discrete state with one or more continua

Imaging resonances in low-energy NO-He inelastic collisions

Slowing down two intersecting beams of helium atoms and nitric oxide molecules to a relative crawl revealed short-lived resonances that matched theoretical predictions remarkably well—a striking feat on both sides, given the challenge of accurately modeling NO's unpaired electron.

Scattering resonances in bimolecular collisions between NO radicals and H2 challenge the theoretical gold standard

Measurements of low-energy collisions between NO radicals and H2 molecules with a resolution that challenges the most sophisticated quantum chemistry calculations at the CCSD(T) level are presented.