the following figure qualitatively represents the energy diagram of the vibrational levels of a diatomic molecule in the anharmonic approximation. The so-called hot bands correspond to transitions with a starting point different from the fundamental level u=0. How many hot bands will be observed in a spectrum of infrared absorbent at a temperature of 1000K? the equilibrium vibration waveform of the diatomic molecule: 1876 cm^-1