Enhancement of muonium emission rate from silica aerogel with a laser   ablated surface
  Emission of muonium ($\mu^+e^-$) atoms from a laser-processed aerogel surface into vacuum was studied for the first time. Laser ablation was used to create hole-like regions with diameter of about 270$~\mu$m in a triangular pattern with hole separation in the range of 300--500$~\mu$m. The emission probability for the laser-processed aerogel sample is at least eight times higher than for a uniform one. 
G.A. Beer, Y. Fujiwara, S. Hirota, K. Ishida, M. Iwasaki, S. Kanda, H.   Kawai, N. Kawamura, R. Kitamura, S. Lee, W. Lee G.M...
physics.ins-det hep-ex physics.atom-ph