确实 是wavenumbers

波数单位cm-1，
英文读作：reciprocal centimeter 或者inverse centimeter,
附上一段英文文字做参考：
Reciprocal length or inverse length is a measurement used in several branches of science and mathematics. As the reciprocal of length, common units used for this measurement include the reciprocal metre or inverse metre (m−1), the reciprocal centimetre or inverse centimetre (cm−1), and, in optics, the dioptre.