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Which risk increases when laser pulse duration nears molecular vibrational periods?

A)Reduced spectral broadening of pulse
B)Increased molecular fragmentation yield
C)Enhanced coherent phonon generation
D)Suppressed multiphoton ionization rate

💡 Explanation

Increased molecular fragmentation occurs due to resonant excitation of molecular vibrational modes with the laser frequency, leading to bond breaking in a process similar to laser-induced breakdown spectroscopy. Therefore, fragmentation increases rather than alternative processes which require non-resonant continuous irradiation.

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