The enVISion transient absorption spectrometer is a completely self-contained instrument which includes all of the components needed to conduct measurements, including the excitation laser. This instrument has an unmatched probe wavelength rang of 250 nm to 2550 nm, and pump wavelengths of 355 nm, 532 nm, or 1064 nm. This system also has the highest sensitivity of any transient absorption spectrometer with a detection limit of 100 nanoO.D. change in absorbance and is able to achieve such high sensitivities in a short amount of time. While boasting the highest performance of any spectrometer available, the enVISion instrument is also designed to be used by both experienced and inexperienced users of transient absorption. The unique design of the instrument makes the transient absorption measurements as simple to perform as a traditional UV/Vis.