American Physics Technology LLC develops particle beam technologies and their applications. The firm is currently focused on applications of Gas Cluster Ion Beam (GCIB) and Accelerated Neutral Atom Beam (ANAB) technologies for nano-scale modification of critical surfaces for science and industry. These technologies are used to of smooth, clean, and polish large planar and non-planar surfaces, reducing the average roughness (Ra) to an Angstrom. The technology has applications for constructing advanced optics for reflecting and focusing neutrons for use at neutron scattering research centers worldwide.