entrance slit

entrance slit

[′en·trəns ‚slit]
(spectroscopy)
Narrow slit through which passes the light entering a spectrometer.
References in periodicals archive ?
9 comes with a 150 lines/mm grating, 25 micron entrance slit and a non-fluorescing longpass filter that transmits >1000 nm.
9 comes with a 150 lines/mm grating, 25micron entrance slit and a non-fluorescing longpass filter that transmits >1000nm.
Briefly, a Ni-coated toroidal mirror collects 20 mrad horizontally and the full vertical extent of the emission from SURF III and focuses the radiation onto an entrance slit.
It was built in a mahogany housing for stability and had an adjustable width entrance slit, a 20-cm focal length quartz collimating lens, a Comu quartz prism, a 20-cm quartz camera lens and a plate holder for a 3.
The spectrometer should be able to connect the optical fiber on entrance slit.
The measurements will be carried out using a conventional fluorimeter consisting of a monochromator with a CCD detector at the exit slit, and a source consisting of a cuvette with a illumination region parallel to the entrance slit of the monochromator.