Which of the following statements are true of atomic emission spectroscopy (AES)?
I Atoms are promoted to an excited state with a laser.
II Atoms are promoted to an excited state by gaining energy from collisions with other atoms or from the high thermal energy of the flame.
III The intensity of emitted light is proportional to analyte concentration.
IV Plasma often replaces flame in AES.
A)III and IV
B)I,III,and IV
C)II,III,and IV
D)II and III
E)I and III

Question

Quizplus · Accepted Answer

Atomic emission spectroscopy (AES) involves the excitation of atoms, which can occur through collisions with other atoms or from the high thermal energy of a flame (II). The intensity of the emitted light is indeed proportional to the concentration of the analyte (III), and plasma is often used as an alternative to flame in AES for its ability to provide a more uniform and hotter environment for atom excitation (IV). Using a laser for excitation is more characteristic of laser-induced breakdown spectroscopy (LIBS) rather than traditional AES, making statement I incorrect in this context.

Which of the Following Statements Are True of Atomic Emission