Explanation

Mass spectroscopy primarily provides information about the ratio of the charge (e) of an ion to its mass (m), known as the e/m ratio. This technique is commonly used to identify compounds, determine their molecular structure, and measure the isotopic composition of elements. While mass is indirectly related to mass spectroscopy, it is not the main focus of the technique. Isotopes can indeed be identified and quantified using mass spectroscopy, but again, the primary information derived from the technique is the e/m ratio.