book > index > index D
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Dalton’s law 21
DC oil, see ‘Dow Corning oil’
Debye effect 68
Debye temperature 70
decomposition of materials 630
-, chemical 630
-, degradation rate 631,632
-, thermal 630
degassing (see also ‘outgassing’)
-, from the bulk 649
-, hydrogen 653
-, rate 633
degreasing agents 652
demountable joints 575
desorption 63
-, electron stimulated 424,478,479
-, photon-stimulated 654
-, rate 73
diaphragm bellows 613
diaphragm pump 160,161,163,230,233
-, combined use with molecular pumps 234
-, pump properties 235
-, pumping speed curves 234
dibasic acid esters, see ‘synthetic lubricants’
Diffelen oil 223,673,674
differential ion pump 330
diffusion 54,63,90,619
-, dissociation 90,96,622
-, mutual 58,60
-, self 55
diffusion coefficient 55,92
diffusion pump 4,160,211
-, back-diffusion 220
-, backing pump 214
-, ‘belly shaped’ pump body 220
-, critical backing pressure 214,221,225
-, crossover pressure 227
-, diffuser 200
-, fractionation 216
-, Jaeckel’s diffusion model 202
-, oil vapour back-streaming 215,217,359,656
-, pump fluids 214,223,673,674
-, pump properties 222
-, pumping speed 221,357
-, pumping speed curves 222
-, reverse cap (ring-shaped Laval nozzle) 212
-, safety measures 228
-, self-cleaning 217
-, system operation (pumping procedure) 225
-, ultimate pressure 220
-, ultra-high vacuum with 219
-, vapour screen 212
diffusion pump oils 215,223
-, esters of phthalic acid and sebacic acid 223,673,674
-, Fomblin oil 225,628,630,673,674
-, (saturated) hydrocarbon oils 223,673,674
-, polyphenyl ether oil 224,359,652,673,674
-, silicone oil 223,502,628,629,673,674
diode pump 326
-, differential ion pump (Noble diode pump) 330
-, Galaxy diode pump 330
-, with slotted cathodes 330
disc-MDP 303,306
displacement pump 160
dissociation diffusion 90,96,622
dissociative chemisorption 87
Dow Corning (DC) oil 224,628,673,674
drum-MDP 272,303
dry pumps 162
dry rotary pumps 5,163,235
-, claw pump 260
-, oil-free multivane pump 239
-, Roots pump 243
-, screw pump 268
-, scroll pump 240
-, side channel blower 235
dynamic joints 579,595
dynamic shaft seal, see ‘dynamic joints’
