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. 2014 Dec 12;4:7451. doi: 10.1038/srep07451

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(a) Background emission spectrum from argon gas. In the absence of samples mainly N₂ bands are observed between 300 to 400 nm (power about 5 W). (b) Stability evaluation by the peak height record at 696.36, 750.41, 763.53, and 811.4 nm sampling in 2 h with a 1 min interval.