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XUV free-electron laser desorption of NO from graphite (0001)

机译:XUV自由电子激光从石墨中解吸NO(0001)

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摘要

We report results of femtosecond laser induced desorption of NO from highly oriented pyrolytic graphite using XUV photon energies of hν = 38 eV and hν = 57 eV. Femtosecond pulses with a pulse energy of up to 40 μJ and about 30 fs duration generated at FLASH are applied. The desorbed molecules are detected with rovibrational state selectivity by (1 + 1) REMPI in the A ~2Σ~+ ← X~2Π γ-bands around λ = 226 nm. A nonlinear desorption yield of neutral NO is observed with an exponent of m = 1.4 ± 0.2. At a fluence of about 4 mJ/cm~2 a desorption cross section of σ_1 = (1.1 ± 0.4) × 10~(-17) cm~2 is observed, accompanied with a lower one of σ_2 = (2.6 ± 0.3) × 10~(-19) cm~2 observable at higher total fluence. A nonthermal rovibrational population distribution is observed with an average rotational energy of 〈E _(rot)〉 = 38.6 meV (311 cm~(-1)), a vibrational energy of 〈E_(vib)〉 = 136 meV (1097 cm~(-1)) and an electronic energy of 〈E_(el)〉 = 3.9 meV (31 cm~(-1)).
机译:我们报告了飞秒激光诱导的高取向热解石墨中NO的解吸结果,该XUV光子能量为hν= 38 eV和hν= 57 eV。飞秒脉冲的能量高达40μJ,在FLASH上产生的持续时间约为30 fs。通过(1 +1)REMPI在λ= 226 nm附近的A〜2Σ〜+←X〜2Πγ带中以旋转振动态选择性检测到解吸的分子。观察到中性NO的非线性解吸产率,指数为m = 1.4±0.2。在大约4 mJ / cm〜2的注量下,观察到σ_1=(1.1±0.4)×10〜(-17)cm〜2的解吸横截面,σ_2=(2.6±0.3)×总通量较高时可观察到10〜(-19)cm〜2。观察到非热振动分布,其平均旋转能量为〈E _(rot)〉 = 38.6 meV(311 cm〜(-1)),振动能量为〈E_(vib)〉 = 136 meV(1097 cm〜 (-1))和 = 3.9 meV(31 cm〜(-1))的电子能量。

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