A parallel radial mirror analyzer (PRMA) (700) for facilitating rotationally symmetric detection of charged particles caused by a charged beam incident on a specimen is disclosed. The PRMA comprises a zero-volt equipotential grid (728), and a plurality of electrodes (702, 704, 706, 708, 710, 712, 714, 716, 718, 720, 722) electrically configured to generate corresponding electrostatic fields for deflecting the charged particles in accordance with respective energy levels of the charged particles to exit through the grid (728) to form corresponding second-order focal points on a detector (206). The detector (206) is disposed external to the corresponding electrostatic fields. A related method is also disclosed.