Measurement of momentum distribution of lightatoms and molecules in condensed matter systems using inelastic neutron scattering

Quantum effects in water: proton kinetic energy maxima in stable and supercooled liquid

“…DINS complements microscopic structural studies and allows a quantitative comparison with quantum Monte Carlo simulations [8,9]. These possibilities and a variety of successful experiments on light atoms and molecules make DINS technique a unique and well established tool to investigate the hydrogen bonding [17] and intermolecular structure of water under various conditions [11].…”

“…Data have been corrected for multiple scattering, aluminum and oxygen signals. At high energy, w, and high momentum, q, transfers neutron scattering is well described within the framework of the Impulse Approximation (IA) [11]. Within the IA framework the dynamical structure factor is related to the n(p) through the relation:…”

“…It is based on neutron scattering measurements at high energy (1 eV < w < 200 eV) and wave vector, (20Å −1 < q < 300Å −1 ) transfers. DINS probes both the short-time dynamics and local environment of the light atoms [11]. The high energy and wave vector transfers achieved allow the scattering process to be described within the framework of the Impulse Approximations (IA) [16].…”

The very low angle detector for high-energy inelastic neutron scattering on the VESUVIO spectrometer

“…Consider a scattering process in which the system undergoes a transition from an initial state at energy E i to a final state of energy E f , while the neutron is scattered from an initial state of wave vectork 0 and energy E 0 to a final state of wave vectork 1 and energy E 1 . In the first Born approximation, the double differential scattering crosssection is given by [25] …”

“…The investigation of condensed matter at small scales of time ðp10 À15 sÞ and distances ðp1Å À1 Þ is very attractive, as information on the single particle dynamics, namely atomic momentum distribution nðpÞ and mean kinetic energy hE K i, can directly be accessed through the deep inelastic neutron scattering (DINS) technique [1][2][3]. On the other hand, epithermal neutrons allow to access the kinematical region of the ðq; oÞ space characterized by oX1 eV and qp10Å À1 , i.e.…”