Hyperpolarized cesium ions doped in a glass material

Area of Science:

• Atomic Physics
• Solid-State NMR Spectroscopy
• Materials Science

Background:

• Hyperpolarized (HP) ¹³³Cs nuclear magnetic resonance (NMR) is a sensitive spectroscopic technique.
• Efficiently injecting spin polarization into materials is crucial for enhancing NMR signal detection.
• Understanding spin polarization mechanisms in solid materials is an ongoing area of research.

Purpose of the Study:

• To investigate the effect of elevated temperatures on HP ¹³³Cs NMR signal generation.
• To elucidate the dominant mechanism for nuclear spin injection into borosilicate glass at high temperatures.
• To explore the potential of laser-induced heating for enhancing HP NMR signals.

Main Methods:

• Optical pumping of cesium vapor to create HP ¹³³Cs.
• Measurement of HP ¹³³Cs NMR signals from borosilicate glass cell walls at 9.4T.
• Controlled heating of the glass cell walls using intense, non-resonant laser irradiation.

Main Results:

• Significant enhancement of integrated HP ¹³³Cs NMR signals was observed with laser heating.
• NMR signal characteristics, including integrated intensity and line width, varied with laser power (glass temperature).
• The observed enhancements suggest a mechanism beyond surface spin-exchange with pre-existing ions.

Conclusions:

• Absorption and transport of HP ¹³³Cs atoms into the bulk glass material is the dominant spin injection mechanism at elevated temperatures.
• Laser-induced heating is an effective method for modulating and enhancing HP NMR signals in glass.
• This study provides the first experimental demonstration of bulk spin polarization injection into glass via HP atom absorption and transport.