Orange emission was observed during multibubble sonoluminescence at 1 MHz in water saturated with noble gas. The emission arose in the vicinity of the peeled ground electrode of a piezoceramic transducer exposed to water, suggesting that cavitation bubbles were affected by the electric fields that leaked from the transducer. The spectrum of the emission exhibited a broad component whose intensity increased towards the near-infrared region with peaks at 713 and 813 nm. The spectral shape was independent of the saturation gas of He, Ne, or Kr. The broad component was attributed to the superposition of lines due to vibration-rotation transitions of water molecules, each of which was broadened by the high pressure and electric fields at bubble collapse. An emission mechanism based on charge induction by electric fields and the charged droplet model is proposed.

在充满稀有气体的水中，在1 MHz的多泡声致发光过程中观察到橙色发射。发射发生在暴露于水的压电陶瓷换能器的接地电极附近，这表明空化气泡受到从换能器泄漏的电场的影响。发射光谱显示出一个宽泛的分量，其强度朝着近红外区域增加，并在713和813 nm处出现峰值。光谱形状与He，Ne或Kr的饱和气体无关。宽泛的成分归因于水分子的振动-旋转过渡引起的线的叠加，水分子在气泡破裂时受到高压和电场的作用而变宽。