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Physics Letters A

A nonlinear optical test for the collapse of wave functions during intermolecular collisions in gases

I. E. Mazets, Boris G. Matisov, E. Abraham, Norbert Leinfellner

Published Jul 1, 1998• 0 citations
Publisher
DOI
10.1016/s0375-9601(98)00427-7

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Three qRules governing the collapse of a wave function are given in another paper. In most situations the predictions of this theory are identical with the predictions of other foundation theories. However, there is at least one experiment in which the qRules predict results that are characteristically different from other theories. These results are shown to be a function of molecular collisions in an experiment proposed by Collett and Pearle. Wave reductions in other collapse theories are distinctly not a function of collisions. Keywords: foundation theory, measurement, qRules, state reduction, wave collapse.
Long range intermolecular interaction potential surface of CaF ( 2 Σ + ) was simulated by employing the MOLPRO program and using the RCCSD(T)/def2-TZVP theory. The predicted data were further fitted to obtain the collision cross-section. The elastic collision cross-section of CaF at the temperature around 2 mK is as high as 6.5×10 −9 cm 2 and the collision rate is over 4.1×10 6 Hz. Additionally, we found that an orientation electric field will simplify the intermolecular interaction potential function from quaternary into ternary and the collision cross-section will be raised by about three orders. All-optical evaporative cooling of cold CaF is discussed in the conclusion.
There are few proposals, which explicitly allow for (experimentally testable) deviations from standard quantum theory. Collapse models are among the most-widely studied proposals of this kind. The Schrödinger equation is modified by including nonlinear and stochastic terms, which describe the collapse of the wave function in space. These spontaneous collapses are rare for microscopic systems, hence their quantum properties are left almost unaltered. On the other hand, collapses become more and more frequent, the larger the object, to the point that macroscopic superpositions are rapidly suppressed. The main features of collapse models will be reviewed. An update of the most promising experimental tests will be presented.