Disclosed are various examples related to ion or particle spectrometry utilizing a monolithic collimator and energy analyzer. In one example, a particle selection device includes a single substrate including a curved channel energy analyzer section and a straight channel collimator section, wherein particles pass through the collimator section and enter the energy analyzer section of the substrate. The channel outlets in the collimator section are aligned with the channel inlets of the energy analyzer section. Electric and/or magnetic fields can be applied across the channels of the energy analyzer for ion or particle discrimination. A particle detector at the outlet of the energy analyzer section can provide indications of detected ions and/or particles.