The molecular beam machine is a stainless-steel differential vacuum chamber. It is a three attached vacuum chambers; each connected to its corresponding vacuum diffusion pump. They are interconnected throughout micrometric holes manually controlled by mechanical valves. The first (source) chamber, where a quartz nozzle is allocated to generate the molecular sample in the gas phase, can achieve about 10^-5 Torr. The next (buffer) chamber may be able to achieve about 10^-6 Torr. And the last (research) chamber might be able to achieve 10^-7 Torr; since, liquid nitrogen may be used as a cryogenic fluid to enhance its vacuum conditions.

Everyone of the diffusion pumps works with a special silicone oil, which is heated up by adapted electrical resistances to form a laminar flow inside, condensed by chilled water provided by an adapted water chiller.

Everyone of the chambers is connected through a common line to a mechanical vacuum machine provided with a booster to enhance its operation conditions. Such mechanical vacuum system may achieve about 10^-2 Torr; necessary as a preliminary vacuum level in order to get started each one of the three diffusion pumps attached to every chamber.

Moreover, the aligning procedure of the quartz nozzle plays an important role on succeeding getting molecular signal out of the beam machine; since, the micrometric hole at the tip of the nozzle needs to be centered towards another micrometric hole in a metallic skimmer to pass the molecular beam to the next vacuum chamber, and so on. Therefore, the molecular beam might be, eventually, perpendicularly crossed by the laser UV beam to excite the molecular system to be analyzed thereafter.