Is there a comprehensive list of 语气词 or 语气助词? Or a place I can research more about them?
Modern Chinese / Mandarin:


啊 a
噢 ao
哎 ai
唉 ai
吧 ba
呗 bei
哦 o
喔 o
哈 ha
嚯 huo
啦 la
嘞 lei
哩 li
啰 luo
咯 lo
喽 lou
咧 lie
吗 ma
嘛 ma
哪 na
呐 na
哇 wa
呦 you 
哟 yo
唷 yo
吁 yu


Classic Chinese:


呔 dai
呵 he
乎 hu
兮 xi
矣 yi
也 ye (means: too, also, in modern Chinese)
哉 zai