Triplet oxygen, systematically but less commonly, 1,2-dioxidanediyl, is normal, gaseous oxygen (O2, dioxygen) in its ground state. It is therefore classified as an inorganic chemical, and more specifically as a particular electronic state of one allotrope of the inorganic chemical element, oxygen. In this particular state, according to one type of modern bonding theory, the electron configuration of the oxygen molecule has two electrons occupying two molecular orbitals (MOs) of equal energy (that is, degenerate MOs), therefore remaining unpaired. These orbitals are classified as antibonding and are of higher energy, so the resulting bonding structure between the oxygen atoms is weakened (i.e., is higher in energy)—for instance, it is higher in energy than the bonding in dinitrogen, where the corresponding antibonding orbitals are empty. The spectroscopic molecular term symbol for triplet (ground state) oxygen is 3Σ− g.[bettersourceneeded]

CAS：7782-44-7
中文别名：氧;
英文别名：hydroperoxide radical;oxygen-16;hydroperoxy radical;lox;hydroperoxo radical;oxigeno;peroxide radical;pureoxygen;Dioxygen;hydroperoxyl radical;Oxygen;peroxyl radical;hyperoxia;oxygengas;oxygene;perhydroxyl radical;
分子式：O2
分子量：31.9988
精确质量：31.9898
Psa：34.14
Logp：0.067

UNII：S88TT14065

外观与性状：无色气体
密度：1.429（0℃）
沸点：−183°C(lit.)
熔点：−218°C(lit.)
闪点：none
折射率：1.776
稳定性：Stable. Vigorously supports combustion. Incompatible with phosphorus, organic materials, many powdered metals.
储存条件：库房通风低温干燥,与还原剂、可燃物分开存放
蒸汽密度：1.11 (vs air)
蒸汽压：3.27E-25mmHg at 25°C

RTECS号：RS2060000
安全说明：S17-S45-S36/37/39-S26-S61
危险类别码：R8
WGK Germany：-
海关编码：2804400000
危险品运输编码：UN 1072 2.2
危险类别：2.2
危险品标志：O
信号词：Danger
危险性描述：H270; H280
危险标志：GHS03, GHS04
危险性防范说明：P220; P410 + P403

生产方法
1.空分法 首先清除灰尘和机械杂质后的空气,在压缩机中压缩。清除压缩空气中二氧化碳。干燥压缩空气,经液化、精馏、分离成氧和氮,氧气贮藏在氧气柜,液氧送入贮槽,压缩的氧气充填氧气瓶中。 1.用于金属焊接和切割。与乙炔混合可获得极高的火焰温度使金属熔融,广泛用于熔炼和顶吹氧炼钢。与水蒸气混合可用以代替空气吹入煤气气化炉内,得到较高热值的煤气。医疗上用于氧化疗法,以治疗肺炎、煤气中毒症等。化学工业用于强化硝酸和硫酸的生产。液态氧可用作液氧炸药和火箭推进剂燃剂。
用途
1.用于金属焊接和切割。与乙炔混合可获得极高的火焰温度使金属熔融,广泛用于熔炼和顶吹氧炼钢。与水蒸气混合可用以代替空气吹入煤气气化炉内,得到较高热值的煤气。医疗上用于氧化疗法,以治疗肺炎、煤气中毒症等。化学工业用于强化硝酸和硫酸的生产。液态氧可用作液氧炸药和火箭推进剂燃剂。