Laser and pinching discharge plasmas spectral characteristics in water   window region 2
  Water window emission spectra of two laboratory nitrogen plasma sources were examined with a free standing grating spectrometer (FSGS). The highest line intensities at the wavelength 2.88 nm achievable with the sources were compared. Pulse energies for this line were judged as 0.02 mJ/srad and 0.16 mJ/srad with laser produced plasma system and pinching discharge plasma, respectively. The spectral resolution was found about 0.01 nm at 3rd order of spectral lines around wavelength 2.5 nm. 
Petr Kolar, Miroslava Vrbova, Michal Nevrkla, Pavel Vrba, Alexandr   Jancarek
physics.plasm-ph