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铜虫 (初入文坛)

[求助] 文献有一段看不懂,求助各位

Dark-field optical microspectroscopy was used to detect
changes in the individual nanoparticle LSPR scattering
spectrum upon resonant laser illumination . The
measured LSPR spectrum in air was found to peak at 563 nm.
When the microchamber was filled with DI water with a
temperature of 20 °C, the LSPR was observed to redshift to
598 nm. The redshift of 35 nm is in good agreement with the
redshift obtained from a Mie calculation for the same particle
embedded in air compared with that in water at 20 °C (ε =
1.778). During laser illumination while the nanoparticle was
surrounded by water, however, the LSPR was observed to
blueshift to 581 nm.The observed shift implies a decreased
refractive index of the medium directly surrounding the
nanoparticle, which we interpret as resulting from a water
vapor envelope surrounding the nanoparticle.

   这是在看的论文中的一段,有一些看不懂的地方。这三次测量都应该是在光照条件下吧?为什么第二次没有产生包覆粒子的气泡?

[ Last edited by want-you on 2013-10-10 at 14:45 ]
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