spectroscopically
Adverb
Meaning
By means of a spectroscope
By the analysis of spectra
Source: en.wiktionary.orgSynonyms
Examples
As is observed for most elements, a diatomic scandium hydride has been observed spectroscopically at high temperatures in the gas phase.
Symmetric hydrogen bonds have been observed recently spectroscopically in formic acid at high pressure (>GPa).
Gadolinium was first detected spectroscopically in 1880 by de Marignac who separated its oxide and is credited with its discovery.