Nanosecond time-resolved spectroscopy with a pulsed tunable dye laser and single photon time correlation

Area of Science:

• Physical Chemistry
• Spectroscopy
• Materials Science

Background:

• Analyzing systems with low emission rates or long-lived excited states presents significant challenges for traditional spectroscopy.
• High temporal and spectral resolution are crucial for understanding complex relaxation dynamics and energy transfer processes.

Purpose of the Study:

• To develop and demonstrate a nanosecond time-resolved spectroscopy technique suitable for extremely low emission rates.
• To apply this technique to investigate the excited state relaxation dynamics of specific lanthanide ions.

Main Methods:

• Utilized a nitrogen (N2) laser pumped tunable dye laser system.
• Employed single photon time correlation techniques for high temporal resolution.
• Applied monochromatic excitation for selective probing of energy levels.

Main Results:

• Achieved 5-nanosecond (nsec) temporal resolution.
• Obtained 2 cm(-1) spectral resolution.
• Successfully applied the technique to study the relaxation between excited states of terbium ions (Tb(3+)) in Y(OH)3.

Conclusions:

• The developed nanosecond time-resolved spectroscopy technique is effective for studying systems with low quantum efficiency or long excited state lifetimes.
• This method provides a valuable tool for detailed investigation of excited state dynamics in various materials, particularly those requiring monochromatic excitation.