Az arzén izotópjai

Az arzénnak 33 izotópja és legalább 10 izomerje ismert, melyek közül csak egy, a 75As, stabil, az arzén tehát tiszta elemnek tekinthető. A leghosszabb életű radioizotóp a 73As, ennek felezési ideje 80 nap.

Standard atomtömeg: 74,92160(2) u.

Táblázat

nuklid
jele
Z(p) N(n)  
izotóptömeg (u)
 
felezési idő bomlási
mód(ok)[1][m 1]
leány-
izotóp(ok)[m 2]
magspin jellemző
izotóp-
összetétel
(móltört)
természetes
ingadozás
(móltört)
gerjesztési energia
60As 33 27 59,99313(64)# p 59Ge 5+#
61As 33 28 60,98062(64)# p 60Ge 3/2−#
62As 33 29 61,97320(32)# p 61Ge 1+#
63As 33 30 62,96369(54)# p 62Ge (3/2−)#
64As 33 31 63,95757(38)# 40(30) ms
[18(+43−7) ms]
β+ 64Ge 0+#
65As 33 32 64,94956(32)# 170(30) ms β+ 65Ge 3/2−#
66As 33 33 65,94471(73) 95,77(23) ms β+ 66Ge (0+)
66m1As 1356,70(17) keV 1,1(1) µs (5+)
66m2As 3023,9(3) keV 8,2(5) µs (9+)
67As 33 34 66,93919(11) 42,5(12) s β+ 67Ge (5/2−)
68As 33 35 67,93677(5) 151,6(8) s β+ 68Ge 3+
68mAs 425,21(16) keV 111(20) ns
[?107(+23−16) ns]
1+
69As 33 36 68,93227(3) 15,2(2) perc β+ 69Ge 5/2−
70As 33 37 69,93092(5) 52,6(3) perc β+ 70Ge 4(+#)
70mAs 32,008(23) keV 96(3) µs 2(+)
71As 33 38 70,927112(5) 65,28(15) óra β+ 71Ge 5/2−
72As 33 39 71,926752(5) 26,0(1) óra β+ 72Ge 2−
73As 33 40 72,923825(4) 80,30(6) nap EC 73Ge 3/2−
74As 33 41 73,9239287(25) 17,77(2) nap β+ (66%) 74Ge 2−
β (34%) 74Se
75As 33 42 74,9215965(20) Stabil 3/2− 1,0000
75mAs 303,9241(7) keV 17,62(23) ms 9/2+
76As 33 43 75,922394(2) 1,0942(7) nap β (99,98%) 76Se 2−
EC (0,02%) 76Ge
76mAs 44,425(1) keV 1,84(6) µs (1)+
77As 33 44 76,9206473(25) 38,83(5) óra β 77mSe 3/2−
77mAs 475,443(16) keV 114,0(25) µs 9/2+
78As 33 45 77,921827(11) 90,7(2) perc β 78Se 2−
79As 33 46 78,920948(6) 9,01(15) perc β 79mSe 3/2−
79mAs 772,81(6) keV 1,21(1) µs (9/2)+
80As 33 47 79,922534(25) 15,2(2) s β 80Se 1+
81As 33 48 80,922132(6) 33,3(8) s β 81mSe 3/2−
82As 33 49 81,92450(21) 19,1(5) s β 82Se (1+)
82mAs 250(200) keV 13,6(4) s β 82Se (5−)
83As 33 50 82,92498(24) 13,4(3) s β 83mSe 3/2−#
84As 33 51 83,92906(32)# 4,02(3) s β (99,721%) 84Se (3)(+#)
β, n (0,029%) 83Se
84mAs 0(100)# keV 650(150) ms
85As 33 52 84,93202(21)# 2,021(10) s β, n (59,4%) 84Se (3/2−)#
β (40,6%) 85Se
86As 33 53 85,93650(32)# 0,945(8) s β (67%) 86Se
β, n (33%) 85Se
87As 33 54 86,93990(32)# 0,56(8) s β (84,6%) 87Se 3/2−#
β, n (15,4%) 86Se
88As 33 55 87,94494(54)# 300# ms
[>300 ns]
β 88Se
β, n 87Se
89As 33 56 88,94939(54)# 200# ms
[>300 ns]
β 89Se 3/2−#
90As 33 57 89,95550(86)# 80# ms
[>300 ns]
91As 33 58 90,96043(97)# 50# ms
[>300 ns]
3/2−#
92As 33 59 91,96680(97)# 30# ms
[>300 ns]
  1. Rövidítések:
    EC: Elektronbefogás
  2. A stabil izotópok félkövérrel vannak kiemelve, a majdnem stabilak (melyek felezési ideje a világegyetem koránál hosszabb) félkövér dőlttel vannak jelölve

Megjegyzések

  • A # jel a nem kizárólag kísérletekből, hanem részben szisztematikus trendekből származó értéket jelöl. A nem kellő megalapozottsággal asszignált spinek zárójelben szerepelnek.
  • A bizonytalanságokat rövid formában – a megfelelő utolsó számjegy után zárójelben – adjuk meg. A bizonytalanság értéke egy standard deviációnak felel meg, kivéve, ahol az izotóp-összetételt és standard atomtömeget a IUPAC nagyobb bizonytalansággal adja csak meg.

Hivatkozások

  1. http://www.nucleonica.net/unc.aspx
  • A.Shore, A. Fritsch, M. Heim, A. Schuh, M. Thoennessen. Discovery of the Arsenic Isotopes. arXiv:0902.4361.

Fordítás

  • Ez a szócikk részben vagy egészben az Isotopes of arsenic című angol Wikipédia-szócikk ezen változatának fordításán alapul. Az eredeti cikk szerkesztőit annak laptörténete sorolja fel. Ez a jelzés csupán a megfogalmazás eredetét és a szerzői jogokat jelzi, nem szolgál a cikkben szereplő információk forrásmegjelöléseként.
A germánium izotópjai Az arzén izotópjai A szelén izotópjai
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