Abstract
We propose a Display-type Ellipsoidal Mesh Analyzer (DELMA) using a newly developed 1p sr wide acceptance angle electrostatic lens (WAAEL), energy aperture and some other electrostatic lenses [1–5] .I t can display two-dimensional angular distributions of charged particles within the acceptance angle of 7 601, which is much larger than the largest acceptance angle range so far and comparable to the displaytype spherical mirror analyzer (DIANA) developed by Daimon et al. [6,8–11]. It also has a focusing capability with 5 times magnification and � 30 mm lateral resolution. The relative energy resolution is typically from 2 to 5 � 10 � 3 depending on the emission area of the sample, as well as on the diameter of
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