To test this idea, she and her colleagues designed a device that uses short pulses of electricity to ionise the surrounding air, creating a purple plume of plasma rich in oxygen ions.

• 为了验证这个想法，她和同事们设计了一种设备，利用短脉冲电使周围空气离子化，产生紫色富含氧离子的等离子火焰。