Shift

If G is a spectra object then G.Shift($\omega_0$) shifts the energy of the spectrum i.e. G_new($\omega$) = G($\omega$-$\omega_0$). G.Shift is similar to the function Spectra.Shift with the difference that it does not make a copy of the spectra object.

Take the spectrum defined in the file definitions.Quanty and shift it by 5.3 eV.

Example.Quanty

dofile("definitions.Quanty")
 
G.Print({{"file","Spectra.dat"}})
G.Shift(5.3)
G.Print({{"file","Spectra.Shift.dat"}})
 
gnuplotScript = gnuplotHead .. [[
set output "Spectra.Shift.ps"
plot "Spectra.dat"  using 1:(-$3  ) title 'T1' with lines ls  1,\
     "Spectra.Shift.dat"  using 1:(-$3) title 'T1 shifted' with lines ls 2
]]
 
file = io.open("Spectra.Shift.gnuplot", "w")
file:write(gnuplotScript)
file:close()
 
os.execute("gnuplot Spectra.Shift.gnuplot")
os.execute("convert -density 1024 Spectra.Shift.ps -resize 1024 Spectra.Shift.png")

The resulting picture is: