The best replacement for emission is absorption.

The best alternatives to emission are rated as following:
★★★★★  absorption
★★  absorption spectra
★  excitation
★  absorption of energy
★  omission
★  atomic absorption
★  absorption spectrum
★  emissions
★  transmission
★  reflection
  stimulated emission
  conducted emission
  radiated emission
  inspection
  spontaneous emission
  immission
  california emission
  electron capture
  absorption spectroscopy
  bottom emission
  fluorescence
  state inspection
  us emission
  beta decay
  absorbance

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Speaking about emission, one probably shouldn't forget about gamma emission.

Other search terms related to emission and their ratings are:
★★★★★ gamma emission
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emission
absorption
absorption spectra