Osnabrück 2002 – wissenschaftliches Programm
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Q: Quantenoptik
Q 413: Quanteneffekte III
Q 413.7: Vortrag
Donnerstag, 7. März 2002, 15:30–15:45, HS 01/E02
Attosecond entanglement of protons in condensed matter at ambient conditions - Neutron Compton scattering results — •C. A. C.-Dreismann1, T. Abdul-Redah1,2, E. B. Karlsson3, and J. Mayers2 — 1Inst. f. Chemie, TU Berlin, Sekr: ER1, D-10623 Berlin — 2ISIS Neutron Facility, R.A.L., Oxfordshire OX11 0QX, U.K. — 3Dept. Physics, Uppsala Univ., S-75121 Uppsala, Sweden
Quantum entangled states between two or more particles are
experimentally realizable in cases where the particles are
extremely well isolated from the environment. However, our work
[1a] demonstrated for the first time that QE may be measurable
even in condensed matter at ambient conditions, if a very fast
scattering technique is applied. Due to their small mass, protons
are particularly suitable for the study of this quantum effect.
Our experiments using neutron Compton scattering (NCS) were
performed with the eVS instrument of the ISIS spallation source.
Here we report striking NCS results from a wide variety of
systems: H2O and D2O, organic liquids (C6H6,
C6D6), polymers (H- and D-polystyrene), amphiphiles
(E1C4) and different metallic hydrides (Nb-, Pd-, and
Y-hydrides). The NCS results reveal that, in the
sub-femtosecond time scale, the measured total cross-section
density of the protons is anomalously reduced by up to 30%.
The characteristic time of the effect is ca. 0.1−1·
10−15s. The effect is of considerable importance
for many physical and chemical processes.
[1] (a) C. A. Chatzidimitriou-Dreismann et al., Phys. Rev.
Lett. 79, 2839 (1997); (b) J. Am. Chem. Soc. 123,
11945 (2001).