If you were to compress a gaseous cloud of one single type of atom in a chamber with colliding in-phase sound waves, the region of increased amplitude where the waves intersect is indeed known as a standing wave or a pressure node. However, the excitation of electrons in this scenario would be minimal or negligible.
Sound waves are pressure waves, and when they collide constructively, they create regions of increased pressure (compression) and regions of decreased pressure (rarefaction). The pressure variations in the gas could potentially affect the behavior of the atoms, but the excitation of electrons, particularly in a simple gaseous cloud of one type of atom, is unlikely to be significant.
The energy carried by sound waves is generally insufficient to cause electronic excitations in atoms directly. For substantial electronic excitations, such as promoting electrons to higher energy levels or causing ionization, much higher energy photons like X-rays or ultraviolet light would typically be required.
The effect of the sound waves on the gas would primarily be to create density variations and cause the gas atoms to move back and forth in response to the pressure changes. This may lead to slight changes in temperature and pressure but would not result in significant electronic excitations. In the case of multi-atomic or complex molecules, there could be some rotational and vibrational excitations due to the collisions with sound waves, but again, this would depend on the specific properties of the gas and the intensity of the sound waves.
If the goal is to excite electrons, other methods, such as applying higher-energy electromagnetic radiation (e.g., laser light) or collisions with high-energy particles, would be more suitable for inducing electronic transitions or ionization in atoms.