Electronic Resource
Springer
The European physical journal
235 (1970), S. 20-34
ISSN:
1434-601X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract The differential spin exchange cross sectionI ex(ϑ, E) for the system K-Cs has been measured as a function of angle for 2°≲ϑ≲40° and collision energy for 1.2 · 10−13 erg ≲E≲2.1 · 10−13erg. Confirming previous experiments it exhibits a maximum neargj≈10°. The angular position of maximum changes with collision energy. Increasing the energy lowers the maximum angle. The analysis of the cross section with regard to information about the interaction of the collision partners turns out to be very complicated. A first few model calculations are presented and discussed. The most obvious, qualitative relations between the singlet and triplet interaction potentials,V 0 andV 1, and the differential spin exchange cross sectionI ex(ϑ) appear to be: 1. The average magnitude ofI ex is markedly different below and above the rainbow angle $$\vartheta _{R_1 }$$ of the shallow triplet potential V1. From the observed intensity drop towards large angles we estimate a lower bound for the triplet potential well depthɛ 1≳1.4 · 10−14 erg. 2. The expected relation between the integral spin exchange cross sectionσ ex and the difference potentialΔV(R)=V 1-V 0 at large distances is also borne out by the differential spin exchange cross section Iex(ϑ) below $$\vartheta _{R_1 }$$ . Relative to the intensity beyond $$\vartheta _{R_1 }$$ the cross section increases if range and strength ofΔV is increased.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01399752
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