ULTRA-HIGH RESOLUTION SPECTROSCOPY

Abstract. Scientific interest in ultracold hydrogen arises from its properties as a Bose-Einstein condensate, its unique roles as a testing ground for atomic theory and a target for ultra high resolution spectroscopy. We describe major developments since the last hydrogen meeting. 

ULTRA HIGH RESOLUTION SPECTROSCOPY OF TRAPPED HYDROGEN... 

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Cooper Schrieffer) fluids is now routine . In addition to these new states of matter that have been formed, cooling atoms to micro-Kelvin temperatures, and below, has enabled both ultra-high resolution spectroscopy studies ° ... 

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CREEP RATE SPECTROSCOPY USING A LASER INTERFEROMETER AS ULTRA-HIGH RESOLUTION TECHNIQUE FOR STUDY OF RELAXATIONS... 

Light element spectroscopy for concentration, electronic, and chemical structure analysis at ultra-high lateral resolution in a TEM or STEM... 

While electron or ion beam techniques can only be applied under ultra-high vacuum, optical techniques have no specific requirements concerning sample environment and are generally easier to use. The surface information which can be obtained is, however, quite different and mostly does not contain direct chemical information. While with infra-red attenuated total reflection spectroscopy (IR-ATR) a deep surface area with a typical depth of some micrometers is investigated, other techniques like phase-measurement interference microscopy (PMIM) have, due to interference effects, a much better surface sensitivity. PMIM is a very quick technique for surface roughness and homogeneity inspection with subnanometer resolution. 

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