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Which risk increases when improperly aligning laser-induced breakdown spectroscopy (LIBS) optics?

A)Sample material absorption increases greatly
B)Excited-state relaxation dominates emission
C)Plasma ignition efficiency drops severely
D)Analyte spectral lines become broadened

💡 Explanation

Plasma ignition weakens at poor alignment because reduced energy density diminishes multi-photon ionization, a nonlinear optical effect that triggers plasma formation. Therefore, ignition efficiency drops, rather than increased absorption, spectral line broadening, or reduced excited-state emission because these occur *after* ignition.

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