Orientation and Alignment Echoes

Abstract

We present what is probably the simplest classical system featuring the echo phenomenon - a collection of randomly oriented free rotors with dispersed rotational velocities. Following excitation by a pair of time-delayed impulsive kicks, the mean orientation/alignment of the ensemble exhibits multiple echoes and fractional echoes. We elucidate the mechanism of the echo formation by kick-induced filamentation of phase space, and provide the first experimental demonstration of classical alignment echoes in a thermal gas of CO_2 molecules excited by a pair of femtosecond laser pulses.

References in corpus (11)

• Manipulation of Molecules with Electromagnetic Fields
• Beam by design: laser manipulation of electrons in modern accelerators
• Echo spectroscopy and quantum stability of trapped atoms
• Impulsive Laser Induced Alignment of Molecules Dissolved in Helium Nanodroplets
• Wave Packet Echoes in the Motion of Trapped Atoms
• Measuring irreversible dynamics of a quantum harmonic oscillator
• Atomic and molecular dynamics triggered by ultrashort light pulses on the atto- to picosecond time scale
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Cited by in corpus (20)

• Quantum control of molecular rotation
• Nonlinear two-dimensional terahertz photon echo and rotational spectroscopy in the gas phase
• Echo Spectroscopy in multi-level quantum-mechanical rotors
• Optimal three-state field-free molecular orientation with terahertz pulses
• All-optical measurement of high-order fractional molecular echoes by high-order harmonic generation
• Rotational coherence spectroscopy of molecules in helium nanodroplets: Reconciling the time and the frequency domains
• Observing collisions beyond the secular approximation limit
• Fractional Echoes
• Echo in a Single Molecule
• Nonadiabatic Laser-Induced Alignment Dynamics of Molecules on a Surface
• Echoes in Unidirectionally Rotating Molecules
• Catastrophes in non-equilibrium many-particle wave functions: universality and critical scaling
• Molecular alignment echoes probe collision-induced rotational-speed changes
• Echo-enhanced molecular orientation at high temperatures
• Intrinsic Calibration of Molecular Alignment Using Rotational Echoes
• Nonlinear theory of transverse beam echoes
• Echoes in a Single Quantum Kerr-nonlinear Oscillator
• Orientation Echoes via Concerted Terahertz and Near-IR excitation
• Impulsively Excited Gravitational Quantum States: Echoes and Time-resolved Spectroscopy
• Echoes in a parametrically perturbed Kerr-nonlinear oscillator