Cavity ring-down observation of Yb(3+) optical absorption in room temperature solution

Area of Science:

• Analytical Chemistry
• Spectroscopy
• Materials Science

Background:

• Studying trivalent lanthanide ions ([Xe]4f(n)) in solution is crucial for various applications.
• Traditional methods like two-color pump-probe luminescence fail for certain ions, such as ytterbium(III) ([Xe]4f(13) Yb(3+)).
• There is a need for alternative spectroscopic techniques to probe these challenging systems.

Purpose of the Study:

• To apply cavity ring-down spectroscopy (CRDS) to measure the optical absorption of ytterbium(III) ([Xe]4f(13) Yb(3+)) in room temperature solution.
• To demonstrate the capability of CRDS for systems where other methods are ineffective.
• To obtain absorption spectra for Yb(3+) and compare them with other lanthanides like Dy(3+) and Eu(3+).

Main Methods:

• Utilized a 1-meter optical cavity with highly reflective mirrors.
• Employed a quartz cuvette containing 1 mL of sample placed centrally within the cavity.
• Recorded ring-down signals as a function of wavelength to construct absorption spectra.

Main Results:

• Successfully obtained the absorption spectrum for the (2)F(5/2)-->(2)F(7/2) transition of Yb(3+) in solution for the first time using CRDS.
• Generated characteristic absorption spectra for dysprosium(III) ([Xe]4f(5) Dy(3+)) and europium(III) ([Xe]4f(6) Eu(3+)) transitions.
• Compared CRDS spectra with single-pass absorption and luminescence spectra to estimate sensitivity.

Conclusions:

• Cavity ring-down spectroscopy is a viable and sensitive technique for probing the optical absorption of Yb(3+) in solution.
• CRDS overcomes limitations of other methods, enabling the study of previously inaccessible lanthanide systems.
• This work opens new avenues for spectroscopic analysis of lanthanide complexes.