Related by context. Frequent words. (Click for all words.) 62 photoluminescence 61 Gamma rays 59 fluorescent molecules 58 laser pulse 58 substorm 58 visible wavelengths 58 plasmons 58 muons 58 aurorae 58 gamma rays 57 X ray emission 57 interferometric 57 photometer 57 pulsed laser 57 shorter wavelengths 57 auroral 57 MeV 57 laser pulses 57 ultraviolet wavelengths 56 photonic crystal 56 keV 56 ionized gas 56 ionised 56 ionize 55 excitons 55 electron beams 55 ultrasonic waves 55 amplitudes 55 optical wavelengths 55 positrons 55 scintillation 55 Cosmic rays 55 photons 54 magnetic reconnection 54 neutrons 54 attosecond 54 magnetic flux 54 Solar flares 54 magnetars 54 muon 54 alpha particles 54 gravitational waves 54 proton collisions 54 terahertz radiation 54 interferometry 54 photon 54 particle beams 54 wavelengths 54 millivolts 54 Gamma ray bursts 53 interferometers 53 fluorescing 53 hydrogen ions 53 cosmic ray 53 fluorophores 53 electron spins 53 oscillatory 53 solar corona 53 GRB # 53 infrared laser 53 particle beam 53 picosecond 53 atomic particles 53 dispersive 53 ionisation 53 ionospheric 52 photometry 52 Crab Nebula 52 phosphorescence 52 fluoresce 52 infrared beam 52 cosmic rays 52 phonon 52 electrically conducting 52 meteoroid 52 planet Uranus 52 fluorescent probes 52 neutrino 52 Hawking radiation 52 Photons 52 active galactic nuclei 52 accretion disk 52 GRBs 52 exciton 52 fluorescent dye 52 dopant 52 auroras 52 X ray beam 52 coronal mass ejection 52 Ultraviolet light 52 photodetector 52 entangled photons 52 infrared radiation 52 WIMPs 52 subatomic particle 52 GeV 51 trillionths 51 gravitational wave 51 near infrared NIR 51 phonons 51 aerosol particles