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367. Interactions between molecules adsorbed on a surface
358
Abstracts 361--375
and thc ra{e o f l\srnlalioP, o f atomic hydrogen I!) an incandescent tungsten filament. I o r pressures [:clo~ 10 7 mm and lilamen| {en3p,eralurcs abe,+0 14751<., the fraction o f inolccules striking the filament surface that is dissociated {s ct)ns[ant alld tit Icasl 0.05. Vah_ics (51"surface coverage and the rate of Formation of atomic ]lyclrogell as a fUllCtiOII Of []lalllCill |ClI~ItCtalLIIC Ltlld ]i',dl'ogcn pressure arc dcrivcd from CXl-~crimcntal data. ,,.~i.
T. W. Hickmott, .I. Chem. Phys., 32. SI(I 82"L March i'-,'(,0.
361. Surface Migration of Nitrogen on Tungsten. Gcrt Ehrlich and F. G. Hudda, .1. ('Item. i°h.l'.;., 32, 942-943, March 1960.
systelll ~.llld tilt_' prcssLirc reduced to about 5
10 ~' Tort. Outgassing is c a r r i e d o u i by induction heating. The total absorption was found to v a r y I¥0111 2 t'.5 3 10 I1 a b s o l b c d molecules cm :~ O1" g e o l / l C l r i e
area.
\ . G.
'\. D. ( ro',;ell. J. ( & ' m . Phv.s., 32, 1576 1577, Ma3 19(~0, 4O 37{I. hmization Potential of Fluorine. Note by John Y. l lcrron and Vernon II. Dibcler, J. Uhcm. l'h)~.. 32, 18S4 IgS5, .hme 1')60. 40
2t71. rl'ransport in l)ilute Gases aud Chemical Forces. Richard K. ()sborl~, J. Chem. Ph3>., 32, 1817-1820, JtlilC 1960.
d0
362. On the Meehauism of the Le~ is-Rayleigh Nitrogen Afierghm. K. D. Bayes and G. B. Kistiakm~sky, .I. Chem. Phys.. 32, 992-1000, April 1960. 40 363. Emission Spectra uf Ne, O,, ai:d N O Molecules Trapped in Solid Matrices. hl. P. Broida 4ncl M. Peyron, .f. ('hum Phl-~.. 32, !06S-l(171, ,'April 1960.
364. Collision of a Gas Atom with a Culd Surface. Thc collisional translcr or kinetic entre5 f r o m Cl g.:is a t o m to a cold solid is invesligated in a shnl'le model. In two limhh~g cases the combhlcd equations o f m o t i o n o1" the atoms and the htttice arc solved cxaclly. 1he efficiency el" cnerg) lransf'cr obtained f r o m these calculations is Datlch Ilighcr than lhat which is prcdicLed f r o m Lennard-Jones" single p h o n e s al~proxhnatioll. {Author) Robert W. Z\vanzig. J. Chem. Phl.s.. 32. I]73--11/7, ,,Xl'ril 1760. 40
365. Electron Capture by Neutral Molecules. P,. E. Stantan, d. Chem. P h y v , 32, 1348-1350. May 1960.
,4t) 366. 1'hermal Conductivity (if tlelium alld H3drogeu at Iligh Temperatures. A steady-state hot \~irc method For me0.sLirirlg the thermal c o n d u c t i v i t y o f light gases in illc lenlpcraturc I'allgc 1200 to 2100 K is described. In contrast It, other mctllods, l'rcc conv c c t i o n CtlFrCllls al]d large tcnli~Claltlre graciiciHs cxb, I ; COl]'vCc_lion ellcots arc shcJv, n to bc negligible, and the cxpel'inlcnta! procedure for elimhaating the large gradient cffcct> is described. Thc thermal conductivity of helium is l\)und to I'ollo:', the equation A 10" 991 0.678 ( T 1200) ca,see, cm dog. over the telllpcrattlre Ialige covered. That For hydrogen ix A 10'; 1434 1.257 (T 1200) cal scc. C111 dog. (/\tilhor)
N o r m a n d C. Bhlis and Joseph B. Mann. J. (TzcH,. Phls., 32. 1459-1465, May 1960. 40
367. lnteraetions between Molecules Adsorbed on a Eurfaee. Oktay Sinanoglu and Kenneth S. Pitzer, d. (/u,m. P h w . , 32, 1279-1288, May 1960.
Mierov,'ave Method of hlvestigatiag the Afierglo~ Gaseous Discharges. See Abstract No. 245.
,%bsorpihul of Sodium and .%rgon liy (;lass,
40 369. Chemisorptiou of (70 un Ni using a Radioactive Tracer. A method is described for measuring the a m o t m t of chcnlisor bed CO on Ni. After cleaning the Ni specimen ix put in a vacuum
40 : 41 : 42 : 31 Scc Abstract No. 305.
40:33 ,\ Vacuum Mierubalaqce and its use iu Studies of Electrou Tube Materials. See Abstract No. 326. 41.
Metals
and Alloys
41 372. *l'he tleat Cal)acit3 alld *lhermodynamie I;uuetiuns of Urauiam f:om 5 ~,n 350 K. H. f2. Fh~to',v and I I. R. lxHw, J. t~fly~. ('/win.. 64, 904-906, July 1960. 41 373. The VulafiliD of Actinium. Note by K. W. Foster and 1_. G. l:aublc, J. Ph.t's, ( h e m . , 64, 95~-960, ,htly 1960. 41:47 374. Vapor Pressure of Thorium. ~tl/IC(/ "S'I(ll('LS, 'q~[]e vapor pressure o[" solid thorium was determined over Ihr temperature interval 1757 to 1956 K by the \aCLILIll3 e\Hl~oratio]1 n'tethod o f l.angnlu/r. Sl'X:cial pLlril]catioii o f the l h o r i u n l v, as nccessq.r]. SillCe traces oI" The., react ,ahh l h o r i u m to give T h e ( g ) . l h o r i u n l also reacts wilh residual gl.tSCOtlS oxyL{cn ill t'nc vacLILHll sysIcIll [O form | ' h e ( g ) . The latter eft'cot ,aas found 1.o be negligible at residual oxygcn pressures of less than 2 10 ~ m e . The ',apor pressure equation for Th(';) ~--Fhlg) is log P~u. 2,'4,780 620 f K 5.991 0.'433. Thcse rcsuhs yieM ,,alues of-.lil'~,.~, ,~1.!, o f 137.3 2?4 kcal m o l e and 136.6 0.51,:cal mole from a slope and third Jay, dctcrnlination, respectixcls, i - r o e all estimate of Ihc prcssurc (,1" 1 h e ( g ) oxcr -fh(s~ contaiuing Tll()_>gs), l),," (Tb()) 196kcal mole. ~Authorl
/X.,I. l)arnel[, \ \ ' . . \ . N/IcCo!lum'andT. :\. Mihlc. J Phv,. (/wn,. 64, 341-346, March 1960. 41 375. Thermionie Properties of Uraaium. [hcllllionic
40 368. Measurements of Mulfieompouent Diffusion ('oeltieients fl~r the C O ~ - H e - N e System using the Point Source Technique. R. k. Walker, N. DeHaas. and A. A. Westenbcrg, J. Chem. FD3 v., 32, 1314-1316, May 1960.
40 : I N of Pulsed
llleastlrClllelilS \~,cre 111ade o11 Llrallitll11 IIICIH[ ill [hc
form o f th'av~ll \~h'c and on lllms o f tlral]itlD1 deposited on tLlllgSiell b), e,.4poraliOli in ultra-high vactitlllL IMt_'astlrelllCllt,, o f the emission ctlrrell{ {is a ftinclion o f aeceleraling i~otcntial and o f the w o r k I'unction o f tile bulk in'tlerial indicated lhat the surface t~c/s p,evcr completely I'rced o f oxide. %'|easLlrelllei1ts Of the t?,tsrk fllnclion and cllliss[on constall[ i \ as a l'Llnt-'lion i d the thicki~ess o f tb,c c'~artorated l}lms shewed both
Abstracts 361--375
and thc ra{e o f l\srnlalioP, o f atomic hydrogen I!) an incandescent tungsten filament. I o r pressures [:clo~ 10 7 mm and lilamen| {en3p,eralurcs abe,+0 14751<., the fraction o f inolccules striking the filament surface that is dissociated {s ct)ns[ant alld tit Icasl 0.05. Vah_ics (51"surface coverage and the rate of Formation of atomic ]lyclrogell as a fUllCtiOII Of []lalllCill |ClI~ItCtalLIIC Ltlld ]i',dl'ogcn pressure arc dcrivcd from CXl-~crimcntal data. ,,.~i.
T. W. Hickmott, .I. Chem. Phys., 32. SI(I 82"L March i'-,'(,0.
361. Surface Migration of Nitrogen on Tungsten. Gcrt Ehrlich and F. G. Hudda, .1. ('Item. i°h.l'.;., 32, 942-943, March 1960.
systelll ~.llld tilt_' prcssLirc reduced to about 5
10 ~' Tort. Outgassing is c a r r i e d o u i by induction heating. The total absorption was found to v a r y I¥0111 2 t'.5 3 10 I1 a b s o l b c d molecules cm :~ O1" g e o l / l C l r i e
area.
\ . G.
'\. D. ( ro',;ell. J. ( & ' m . Phv.s., 32, 1576 1577, Ma3 19(~0, 4O 37{I. hmization Potential of Fluorine. Note by John Y. l lcrron and Vernon II. Dibcler, J. Uhcm. l'h)~.. 32, 18S4 IgS5, .hme 1')60. 40
2t71. rl'ransport in l)ilute Gases aud Chemical Forces. Richard K. ()sborl~, J. Chem. Ph3>., 32, 1817-1820, JtlilC 1960.
d0
362. On the Meehauism of the Le~ is-Rayleigh Nitrogen Afierghm. K. D. Bayes and G. B. Kistiakm~sky, .I. Chem. Phys.. 32, 992-1000, April 1960. 40 363. Emission Spectra uf Ne, O,, ai:d N O Molecules Trapped in Solid Matrices. hl. P. Broida 4ncl M. Peyron, .f. ('hum Phl-~.. 32, !06S-l(171, ,'April 1960.
364. Collision of a Gas Atom with a Culd Surface. Thc collisional translcr or kinetic entre5 f r o m Cl g.:is a t o m to a cold solid is invesligated in a shnl'le model. In two limhh~g cases the combhlcd equations o f m o t i o n o1" the atoms and the htttice arc solved cxaclly. 1he efficiency el" cnerg) lransf'cr obtained f r o m these calculations is Datlch Ilighcr than lhat which is prcdicLed f r o m Lennard-Jones" single p h o n e s al~proxhnatioll. {Author) Robert W. Z\vanzig. J. Chem. Phl.s.. 32. I]73--11/7, ,,Xl'ril 1760. 40
365. Electron Capture by Neutral Molecules. P,. E. Stantan, d. Chem. P h y v , 32, 1348-1350. May 1960.
,4t) 366. 1'hermal Conductivity (if tlelium alld H3drogeu at Iligh Temperatures. A steady-state hot \~irc method For me0.sLirirlg the thermal c o n d u c t i v i t y o f light gases in illc lenlpcraturc I'allgc 1200 to 2100 K is described. In contrast It, other mctllods, l'rcc conv c c t i o n CtlFrCllls al]d large tcnli~Claltlre graciiciHs cxb, I ; COl]'vCc_lion ellcots arc shcJv, n to bc negligible, and the cxpel'inlcnta! procedure for elimhaating the large gradient cffcct> is described. Thc thermal conductivity of helium is l\)und to I'ollo:', the equation A 10" 991 0.678 ( T 1200) ca,see, cm dog. over the telllpcrattlre Ialige covered. That For hydrogen ix A 10'; 1434 1.257 (T 1200) cal scc. C111 dog. (/\tilhor)
N o r m a n d C. Bhlis and Joseph B. Mann. J. (TzcH,. Phls., 32. 1459-1465, May 1960. 40
367. lnteraetions between Molecules Adsorbed on a Eurfaee. Oktay Sinanoglu and Kenneth S. Pitzer, d. (/u,m. P h w . , 32, 1279-1288, May 1960.
Mierov,'ave Method of hlvestigatiag the Afierglo~ Gaseous Discharges. See Abstract No. 245.
,%bsorpihul of Sodium and .%rgon liy (;lass,
40 369. Chemisorptiou of (70 un Ni using a Radioactive Tracer. A method is described for measuring the a m o t m t of chcnlisor bed CO on Ni. After cleaning the Ni specimen ix put in a vacuum
40 : 41 : 42 : 31 Scc Abstract No. 305.
40:33 ,\ Vacuum Mierubalaqce and its use iu Studies of Electrou Tube Materials. See Abstract No. 326. 41.
Metals
and Alloys
41 372. *l'he tleat Cal)acit3 alld *lhermodynamie I;uuetiuns of Urauiam f:om 5 ~,n 350 K. H. f2. Fh~to',v and I I. R. lxHw, J. t~fly~. ('/win.. 64, 904-906, July 1960. 41 373. The VulafiliD of Actinium. Note by K. W. Foster and 1_. G. l:aublc, J. Ph.t's, ( h e m . , 64, 95~-960, ,htly 1960. 41:47 374. Vapor Pressure of Thorium. ~tl/IC(/ "S'I(ll('LS, 'q~[]e vapor pressure o[" solid thorium was determined over Ihr temperature interval 1757 to 1956 K by the \aCLILIll3 e\Hl~oratio]1 n'tethod o f l.angnlu/r. Sl'X:cial pLlril]catioii o f the l h o r i u n l v, as nccessq.r]. SillCe traces oI" The., react ,ahh l h o r i u m to give T h e ( g ) . l h o r i u n l also reacts wilh residual gl.tSCOtlS oxyL{cn ill t'nc vacLILHll sysIcIll [O form | ' h e ( g ) . The latter eft'cot ,aas found 1.o be negligible at residual oxygcn pressures of less than 2 10 ~ m e . The ',apor pressure equation for Th(';) ~--Fhlg) is log P~u. 2,'4,780 620 f K 5.991 0.'433. Thcse rcsuhs yieM ,,alues of-.lil'~,.~, ,~1.!, o f 137.3 2?4 kcal m o l e and 136.6 0.51,:cal mole from a slope and third Jay, dctcrnlination, respectixcls, i - r o e all estimate of Ihc prcssurc (,1" 1 h e ( g ) oxcr -fh(s~ contaiuing Tll()_>gs), l),," (Tb()) 196kcal mole. ~Authorl
/X.,I. l)arnel[, \ \ ' . . \ . N/IcCo!lum'andT. :\. Mihlc. J Phv,. (/wn,. 64, 341-346, March 1960. 41 375. Thermionie Properties of Uraaium. [hcllllionic
40 368. Measurements of Mulfieompouent Diffusion ('oeltieients fl~r the C O ~ - H e - N e System using the Point Source Technique. R. k. Walker, N. DeHaas. and A. A. Westenbcrg, J. Chem. FD3 v., 32, 1314-1316, May 1960.
40 : I N of Pulsed
llleastlrClllelilS \~,cre 111ade o11 Llrallitll11 IIICIH[ ill [hc
form o f th'av~ll \~h'c and on lllms o f tlral]itlD1 deposited on tLlllgSiell b), e,.4poraliOli in ultra-high vactitlllL IMt_'astlrelllCllt,, o f the emission ctlrrell{ {is a ftinclion o f aeceleraling i~otcntial and o f the w o r k I'unction o f tile bulk in'tlerial indicated lhat the surface t~c/s p,evcr completely I'rced o f oxide. %'|easLlrelllei1ts Of the t?,tsrk fllnclion and cllliss[on constall[ i \ as a l'Llnt-'lion i d the thicki~ess o f tb,c c'~artorated l}lms shewed both