氩(原子量:39.948(1))共有25个同位素,其中有3个是稳定的。
Quick Facts 同位素, 衰变 ...
主要的氩同位素
同位素
|
衰变
|
|
丰度
|
半衰期 (t1/2)
|
方式
|
能量 (MeV)
|
产物
|
36Ar
|
0.3336%
|
稳定,带18粒中子
|
37Ar
|
人造
|
35.011 天
|
ε
|
0.814
|
37Cl
|
38Ar
|
0.0629%
|
稳定,带20粒中子
|
39Ar
|
痕量
|
268 年
|
β−
|
0.565
|
39K
|
40Ar
|
99.6035%
|
稳定,带22粒中子
|
42Ar
|
人造
|
32.9 年
|
β−
|
0.599
|
42K
| |
标准原子质量 (Ar, 标准) | |
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|
|
Close
More information 符号, Z ...
符号
|
Z
|
N
|
同位素质量(u) [n 1][n 2]
|
半衰期 [n 1][n 2]
|
衰变 方式[2]
|
衰变 产物 [n 3]
|
原子核 自旋[n 1]
|
相对丰度 (莫耳分率)[n 2]
|
相对丰度 的变化量 (莫耳分率)
|
30Ar
|
18
|
12
|
30.02156(32)#
|
<20 ns
|
p
|
29Cl
|
0+
|
|
|
31Ar
|
18
|
13
|
31.01212(22)#
|
14.4(6) ms
|
β+, p (55.0%)
|
30S
|
5/2(+#)
|
|
|
β+ (40.4%)
|
31Cl
|
β+, 2p (2.48%)
|
29P
|
β+, 3p (2.1%)
|
28Si
|
32Ar
|
18
|
14
|
31.9976380(19)
|
98(2) ms
|
β+ (56.99%)
|
32Cl
|
0+
|
|
|
β+, p (43.01%)
|
31S
|
33Ar
|
18
|
15
|
32.9899257(5)
|
173.0(20) ms
|
β+ (61.35%)
|
33Cl
|
1/2+
|
|
|
β+, p (38.65%)
|
32S
|
34Ar
|
18
|
16
|
33.9802712(4)
|
844.5(34) ms
|
β+
|
34Cl
|
0+
|
|
|
35Ar
|
18
|
17
|
34.9752576(8)
|
1.775(4) s
|
β+
|
35Cl
|
3/2+
|
|
|
36Ar
|
18
|
18
|
35.967545106(29)
|
观测上稳定[n 4]
|
0+
|
0.003336(4)
|
|
37Ar
|
18
|
19
|
36.96677632(22)
|
35.04(4) d
|
ε
|
37Cl
|
3/2+
|
|
|
38Ar
|
18
|
20
|
37.9627324(4)
|
稳定
|
0+
|
6.29(1)×10−4
|
|
39Ar[n 5]
|
18
|
21
|
38.964313(5)
|
269(3) y
|
β−
|
39K
|
7/2−
|
痕量[n 6]
|
|
40 Ar [n 7]
|
18
|
22
|
39.9623831225(29)
|
稳定
|
0+
|
0.996035(4)[n 8]
|
|
41Ar
|
18
|
23
|
40.9645006(4)
|
109.61(4) min
|
β−
|
41K
|
7/2−
|
痕量
|
|
42Ar
|
18
|
24
|
41.963046(6)
|
32.9(11) y
|
β−
|
42K
|
0+
|
|
|
43Ar
|
18
|
25
|
42.965636(6)
|
5.37(6) min
|
β−
|
43K
|
(5/2−)
|
|
|
44Ar
|
18
|
26
|
43.9649240(17)
|
11.87(5) min
|
β−
|
44K
|
0+
|
|
|
45Ar
|
18
|
27
|
44.9680400(6)
|
21.48(15) s
|
β−
|
45K
|
(1/2,3/2,5/2)−
|
|
|
46Ar
|
18
|
28
|
45.96809(4)
|
8.4(6) s
|
β−
|
46K
|
0+
|
|
|
47Ar
|
18
|
29
|
46.97219(11)
|
1.23(3) s
|
β− (99%)
|
47K
|
3/2−#
|
|
|
β−, n (1%)
|
46K
|
48Ar
|
18
|
30
|
47.97454(32)#
|
0.48(40) s
|
β−
|
48K
|
0+
|
|
|
49Ar
|
18
|
31
|
48.98052(54)#
|
170(50) ms
|
β−
|
49K
|
3/2−#
|
|
|
50Ar
|
18
|
32
|
49.98443(75)#
|
85(30) ms
|
β−
|
50K
|
0+
|
|
|
51Ar
|
18
|
33
|
50.99163(75)#
|
60# ms [>200 ns]
|
β−
|
51K
|
3/2−#
|
|
|
52Ar
|
18
|
34
|
51.99678(97)#
|
10# ms
|
β−
|
52K
|
0+
|
|
|
53Ar
|
18
|
35
|
53.00494(107)#
|
3# ms
|
β−
|
53K
|
(5/2−)#
|
|
|
β−, n
|
52K
|
Close
画上#号的数据代表没有经过实验的证明,仅为理论推测。
Believed to undergo double electron capture to 36S (lightest theoretically unstable nuclide for which no evidence of radioactivity has been observed)
Used in argon-argon dating
Generated from 40K in rocks. These ratios are terrestrial. Cosmic abundance is far less than 36Ar.
- Isotope masses from Ame2003 Atomic Mass Evaluation by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in Nuclear Physics A729 (2003).
- Isotopic compositions and standard atomic masses from Atomic weights of the elements. Review 2000 (IUPAC Technical Report) (页面存档备份,存于互联网档案馆). Pure Appl. Chem. Vol. 75, No. 6, pp. 683-800, (2003) and Atomic Weights Revised (2005) (页面存档备份,存于互联网档案馆).
- Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
- Audi, Bersillon, Blachot, Wapstra. The Nubase2003 evaluation of nuclear and decay properties (页面存档备份,存于互联网档案馆), Nuc. Phys. A 729, pp. 3-128 (2003).
- National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the NuDat 2.1 database (页面存档备份,存于互联网档案馆) (retrieved Sept. 2005).
- David R. Lide (ed.), Norman E. Holden in CRC Handbook of Chemistry and Physics, 85th Edition, online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes.