High-speed diffusion spectroscopic imaging based on an echo-planar technique is presented. A pair of diffusion gradients is applied prior to a rapidly oscillating magnetic field gradient which encodes both chemical shift and spatial information. By applying this technique to a phantom consisting of acetone and water, a diffusion spectroscopic image is obtained in about 15 min, about 64 times faster than the time required in the conventional method. The measured diffusion coefficients show good agreement with previously reported values. This kind of diffusion spectroscopic imaging is expected to provide a way to observe more specific metabolism.

Ejected electron spectra from the doubly-excited helium-like ions produced by the double electron capture collisions ofbare ions Bsiand Cb+ with He have been measured using zero-degree Auger electron spectroscopy with a high energy resolution. Electrons from the configuration of (21nf') have been observed for n a 2 in BS+-He collisions and n 3 3 in C"-He collisions. Experimental energy values ofejecred electrons from the ( 2 / 2 / ' )

Ejected electrons from the tripla states of doubly excited 0 " ions, pmduced by 60 keV 06+ + 02 collisions, have been measured with high resolution mudegree elenmn spectroscopy. The niplet staies of doubly excited configumions are selectively produced lhmagh double electron transfer processes with the 0 2 molecular tnrget under single collision conditions.Electrons ejected from the ls'2pnl and ls'31nl' configurations are oberved over a wide energy range. Ejected-electron specha from the O4+(Is13131') are compared with theoretical calculations. The calculation of energy levels of ls'3131' states has been carried out by the Zexpansion method. where 2 is the nuclear charge. Correlation, relativistic and radiative efffm m t a k a into account. Electrons fmm triplet stltes are identified by comparison with ihe wlcularions and the 'singlet state' spectrum pmduced by 06++He collisions.

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An atmospheric pressure chemical ionization (APCI) interface was developed for improved sensitivity in semimicro liquid chromatography/mass spectrometry (LC/MS). This interface consists of a stainless-steel capillary inserted into a bored stainless-steel block, and includes a collision plate perforated by off-center holes and a needle to generate a corona discharge. Optimization of the temperature of the stainless-steel block and the internal volume in the interface increases the ionization efficiency. The sensitivity of a semimicro LC/MS system equipped with this APCI interface is more than one order of magnitude higher than that of a conventional LC/MS system equipped with the existing APCI interface.