How can I read the UPS spectrum when it goes to zero at energies larger than zero eV?

01 January 1970 0 2K Report

The problem is that I have a UPS spectrum like the one in the attached photo. This spectrum goes to zero near E=1.5 eV without having a step near this value. the nearest step is about 5 eV. Most of the information I found in literature deals with spectra goes to zero around zero eV but I didn't find anything related to my case.

Can I calculate the work function using the width of the spectrum? If not, what is the correct procedure to follow to calculate the work function and the ionization potential energy?

Thanx in advance.

Attached an example and how I tried to analyse it.

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