Increase of Spectral Resolution

For moderate spinning speeds in the range of a few kHz, the anisotropic chemical shift is not spun out , but leads to sideband patterns, from which the anisotropies can be retrieved [IS. lb]- However, in complex polymer structures 

---

The sensitivity of the optothermal technique is illustrated by the comparison of the same sections of the overtone spectrum of C2H4 molecules, measured with Fourier, optoacoustic, and optothermal spectroscopy, respectively (Fig. 1.34). Note the increase of spectral resolution and signal-to-noise ratio in the optothermal spectrum compared to the two other Doppler-limited techniques [87]. More examples can be found in [88]. 

---