On Sommerfeld's Surface Wave

Abstract

conclusive, since the differences in spacing between successive elements are about the same as the experimental uncertainties of electron energies. Tentatively, as indicated above, the 52-kev Y-ray is assigned to the /S~-transition and the 38-kev 7-ray to the electron-capture transition. This leaves unaccounted for the origin of the x-rays of americium, so if the above assignments are to be taken seriously, the conversion electrons accompanying the isomeric transition must lie among the Auger electrons. There is some evidence that this is the case.Lead and copper absorption curves showed no hard 7-rays or K x-rays and only the 50-kev soft 7-ray. When compared with the abundance of the conversion electrons, this 7-ray appears to be about 50 percent converted.From arguments (not all consistent) based on relative abundances of x-rays, conversion electrons, and the /3~-particles, Am 242m appears to decay about 60 percent by ^"-emission, 20 percent by L-electron capture, and 20 percent by isomeric transition. All three of the modes of decay give rise to L-series x-rays which, when properly assigned and abundances measured, should aid materially in arriving at a decay scheme and in shedding light on the nuclear processes which result in the particular x-rays of this interesting nucleus.The /3~-particle of the ground state of Am 242 has also been measured, but the accuracy of the end point has not yet been determined with desirable accuracy. The value obtained is 580±30 kev which is consistent with the supposed 52 kev associated with the isomeric transition of Am 242m .

Review of near-field optics and superlenses for sub-diffraction-limited nano-imaging

“…More rigorous electromagnetic calculations of the field distribution of a subwavelength aperture are given by Bethe 72 and Bouwkamp. 73 Similar calculations for the specific case of a SNOM aperture probe were later carried out by Drezet et al 74,75 However, the brief analysis presented here is sufficient to understand the localization of the near-field radiation relevant to the general aperture SNOM concept.…”

Periodic nanostructures for photonics

“…This is, of course, too simplistic. The Bethe-Bouwkamp theory [407,408] of an isolated sub-wavelength size hole in an ideal metal film ( → ∞) rather predicts that the transmittance scales with the sixth power of the ratio of hole radius and wavelength, i.e.,…”

Superradiance around rotating dilatonic black holes

“…The eigenvalue λ of the spheroidal equation for the angular function S(θ) is obtained perturbatively [7] as…”