his studies physical concerned main spectroscopy and electrical
discharges in the rarefied gases. In its spectroscopic studies Pulcker
came to anticipate and Robert Bunsen Gustav R. Kirchhoff that
lines were spectral characteristics for each chemical, also observed
for the first three lines of the spectrum of hydrogen and said that the
same substance may have different spectra at different temperatures.
Regarding the study of electrical discharges in the rarefied gas, in
its experiments Plucker noted that approaching a magnet tube discharge
its position glow on the walls changed. He Inferred
the discharge was diverted by magnetic fields. His experiments were
important but those who brought him to observe that the luminescence
which was produced changed depending on the vacuum that had been done.
Lowering fact, the gas pressure inside the tube had noted that the
luminescence tube decreased while the glass opposite the cathode issued
a greenish light. Was as if that is the cathode issued something and
this issue hits the opposite side to the cathode.