31. Magnetic field lines of an idealized quadrupole field in the plane transverse to the nominal beam direction. 32. Schempp's doctoral thesis was entitled " Nuclear Quadrupole Resonance in Nitrogen Heterocycles ". 33. These measurements led to the discovery in 1939 that the deuteron also possessed an electric quadrupole moment. 34. A quadrupole moment was found between 17 and 95 microkelvins rms, with 90 % confidence level. 35. For example, the " quadrupole moment " is the basis for the next term: 36. It is said that CO 2 has a large quadrupole and N 2 has a smaller one. 37. While the first synchrotrons and storage rings like the Cosmotron and quadrupole / sextupole magnets for beam focusing. 38. In spirit of a Wien filter a combined magnetic, electric quadrupole is achromatic around a given velocity. 39. However, contributions from the current multipoles will typically be much smaller than that of the mass quadrupole . 40. Ions in a quadrupole field experience restoring forces that drive them back toward the center of the trap.
