Specifications include, but are not limited to: Bidder's proposal must include a modern new X-band CW Electron Paramagnetic Resonance (EPR) spectrometer with cryogenic temperature control that measures the concentration and detailed spectral properties of paramagnetic radicals and metal complexes including g-value, hyperfine coupling constants, relation dynamics. MANDATORY. Bidder's proposal must include a X-band CW Electron Paramagnetic Resonance (EPR) spectrometer with cryogenic temperature control must be able to work and control sample temperature from 4K (-269oC) to 363K (90oC) MANDATORY. Bidder's proposal must include a X-band CW Electron Paramagnetic Resonance (EPR) spectrometer with cryogenic temperature control must include spin counting capability without the need for external standards which are extremely difficult to obtain. MANDATORY. Bidder's proposal must include a X-band CW Electron Paramagnetic Resonance (EPR) spectrometer with cryogenic temperature control must have a spectral sensitivity of at least 1.6x10^9 spins per 1 gauss (G) line width with adjustable power and frequency counting capability. MANDATORY. Bidder's proposal must include a X-band CW Electron Paramagnetic Resonance (EPR) spectrometer with cryogenic temperature control must come equipped with Digital control, spectral acquisition, and spectral analysis software. MANDATORY. Bidder's proposal must include a X-band CW Electron Paramagnetic Resonance (EPR) spectrometer with cryogenic temperature control must come with an assortment of microwave cavities, resonators, quartz inserts, and sample holders capable of accommodating flat cells, quarts tubes, quartz capillaries, and solid samples. MANDATORY...