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O-rings 578
O-ring grooves, standard sizes for 579
Octoil 223,673,674
OFHC copper, see ‘copper’
oil for diffusion pumps, see ‘diffusion pump oils’
oil-sealed rotary pumps 161
oil-sealed rotary pumps in practice 193
oil vapour back-streaming 215,217,359,656
oil vapour cracking processes 428
oil vapour traps
-, baffle 218
-, chevron baffle 218,219
-, cold trap 219
-, cooled hat 217,220
oil diffusion pump, see ‘diffusion pump’
oil mist filter 195
one-way valve 180,190,197,199
open ion source 476
operating pressure, see ‘working pressure’
optical windows 599
organic lubricants 647
oscillation pumps 230
outgassing (see also ‘degassing’) 97,616,617,632
-, activation energy 633
-, curves 616,621
-, flat body (theory) 91
-, from the bulk 619,649
-, Langmuir method 36,621,625
-, measurement of 620
-, of surfaces 618
overpressure valve, see ‘pressure relief valve’
oxygen 7,493,668,669,670,671
oxygen free high-conductivity copper, see ‘copper’
