| 光谱学与光谱分析 |
|
|
|
|
|
| Research on Cluster-Assistant Multiple Ionization of Acetonitrile by Intense Nanosecond Laser |
| SHAO Shi-yong1,4,XIAO Xue2,LI Hai-yang3 |
1. Laboratory of Atmospheric Optics, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
2. Key Lab of Environmental Optics & Technology, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China
3. Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
4. Graduate School of Chinese Academy of Sciences, Beijing 100039, China |
|
|
|
|
Abstract To further investigate the relation between cluster and multi-charged ions, the photo-ionization of acetonitrile molecular beam carried by helium was studied by time-of-flight mass spectrometry using 25 ns, 532 nm and 1 064 nm Nd-YAG laser with an intensity of 1010 W·cm-2. When the effused beam of CH3CN at a pressure of about 11 kPa was irradiated by a 532 nm laser, only a few mono-charged ions appeared in the mass spectrum and were clearly resolved, While the pulsed molecular beam seeded in 0.15 MPa He, multi-charged species appeared between H+ and C+,and parent ions containing one or more acetonitrile molecules were also discovered. The intrinsical difference between effused beam and pulsed one was that for the latter it was easier to generate molecule clusters. Adjusting delay time between laser and pulsed valve to shine the laser on different potions of pulsed beam, the change tendency of integral intensity of different multi-charged ions was found to remain similar to that of acetonitrile cluster, and the highest intensity of different ion species appeared at the same 0.75 ms delay time. When the wavelength of laser was changed from 532 nm to 1 064 nm, the type of ions and their proportion from effused beam were alike except intensity, but the result of pulsed beam altered obviously. Multi- charged ions showed peak splitting, which characters CE(Coulomb explode). As a powerful tool to understand some chemical physics processes involved, correlation analysis of the time of flight mass spectrum was used. The spectrum of 532 nm was selected owing to its multi-charged ions distinguished easily. The correlations among Nn+(n=2-5) and Cn+(n=2-4) were all above 0.25, with some even above 0.7, indicating that these ions are highly correlated and probably come from the CE events simultaneously. An electron re-scattering and re-colliding ionization model was proposed to explain the appearances of those multiple charged ions under such low laser intensity. From the theory, the longer wavelength facilitates the energy absorption rate during inverse bremsstrahlung, which leads to the resulting wavelength dependence of the multi-charged atomic ions.
|
|
Received: 2007-06-16
Accepted: 2007-09-28
|
|
|
|
Corresponding Authors:
SHAO Shi-yong
E-mail: shaoshiyong@dicp.ac.cn
|
|
[1] Shimizu S, Kou J, Kawato S, et al. Chem. Phys. Lett.,2000, 317: 609.
[2] Wabnitz H，Bittner L，Castro de. Nature,2002, 420: 482.
[3] Siedschhg C，Rost J M. Phys. Rev. A,2003, 67 : 013404.
[4] Last I，Joshua J. Phys. Rev. A.,2000, 62: 013201.
[5] Tzallas P, Kosmidis C, Graham P, et al. Chem. Phys. Lett.,2000, 332: 236.
[6] Bhardwaj V R, Rayner D M, Villeneuve D M, et al. Phys. Rev. Lett.,2001, 87: 253003.
[7] GUO Xiao-yong, ZHAO Wen-wu, LIN Ying, et al(郭晓勇, 赵文武，林 莺，等). Spectroscopy and Spectral Analysis(光谱学与光谱分析),2008，28(8)：1919.
[8] Kong X L，Luo X L，Niu D M，et al. Chem. Phys. Lett.,2004, 388: 139.
[9] Niu D M，Li H Y，Liang F，et al. Chem. Phys. Lett.，2005, 403: 218.
[10] Luo X L，Niu D M，Kong X L，et al. Chem. Phys.，2005, 310: 17.
[11] XIAO Xue, LI Hai-yang，LUO Xiao-lin, et al(肖 雪，李海洋，罗晓琳，等). Acta Physica Sinica(物理学报)，2005，54(11)：5098.
[12] SHAO Shi-yong，LI Hai-yang，LUO Xiao-lin, et al(邵士勇, 李海洋, 罗晓琳，等). Acta Phys.-Chim. Sin.(物理化学学报),2005,21: 1113.
[13] Card D A, Folmer D E, Sato S, et al. J. Phys. Chem. A, 1997, 101: 3417.
[14] Card D A, Wisniewski E S, Folmer D E，et al. Int. J. Mass. Spectrom.,2003,223: 355.
[15] Frasinski L J, Codling K, Hatherly P A. Science, 1989，246：1029.
[16] Foltin M, Stueber G J, Bernstein E R. J. Chem. Phys., 1998，109：4342.
[17] Keldysh L V. Sov. Phys. JETP, 1965,20: 1307.
[18] Krainov V P, Smirnov M B. Phys. Report,2002, 370: 237. |
| [1] |
LIU Shu-hong1, 2, WANG Lu-si3*, WANG Li-sheng3, KANG Zhi-juan1, 2，WANG Lei1, 2，XU Lin1, 2，LIU Ai-qin1, 2. A Spectroscopic Study of Secondary Minerals on the Epidermis of Hetian Jade Pebbles From Xinjiang, China[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2024, 44(01): 169-175. |
| [2] |
ZHANG Zhi-wei1, 2, QIU Rong1, 2*, YAO Yin-xu1, 2, WAN Qing3, PAN Gao-wei1, SHI Jin-fang1. Measurement and Analysis of Uranium Using Laser-Induced
Breakdown Spectroscopy[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2023, 43(01): 57-61. |
| [3] |
ZHAO Guo-qiang1, QIU Meng-lin1*, ZHANG Jin-fu1, WANG Ting-shun1, WANG Guang-fu1, 2*. Peak Splitting Method of Ion-Beam-Induced-Luminescence Spectrum Based on Voigt Function Fitting[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(11): 3512-3518. |
| [4] |
CAO Su-qiao1, DAI Hui1*, WANG Chao-wen2, YU Lu1, ZUO Rui1, WANG Feng1, GUO Lian-qiao1. Gemological and Spectral Characteristics of Emeralds From Swat Valley, Pakistan[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(11): 3533-3540. |
| [5] |
DENG Xian-ze1, 2, DENG Xi-guang1, 2*, YANG Tian-bang1, 2, CAI Zhao3, REN Jiang-bo1, 2, ZHANG Li-min1, 2. To Reveal the Occurrence States and Enrichment Mechanisms of Metals in Modules From Clarion-Clipperton Zone in Eastern Pacific by High
Resolution Spectroscopy[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(08): 2522-2527. |
| [6] |
WANG Xin-qiang1, 3, HU Feng1, 3, XIONG Wei2, YE Song1, 3, LI Shu1, 3, GAN Yong-ying1, 3, YIN Shan1, 3, WANG Fang-yuan1, 3*. Research on Raman Signal Processing Method Based on Spatial Heterodyne[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(01): 93-98. |
| [7] |
JIAO Qing-liang1, LIU Ming1*, YU Kun2, LIU Zi-long2, 3, KONG Ling-qin1, HUI Mei1, DONG Li-quan1, ZHAO Yue-jin1. Spectral Pre-Processing Based on Convolutional Neural Network[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2022, 42(01): 292-297. |
| [8] |
HE Xiong-fei1, 2, HUANG Wei3, TANG Gang3, ZHANG Hao3*. Mechanism Investigation of Cement-Based Permeable Crystalline Waterproof Material Based on Spectral Analysis[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2021, 41(12): 3909-3914. |
| [9] |
ZHU Zhi-gao1, LIU Ya1*, YANG Jie1, HU Guo-qing2, 3. A Review of Single-Cavity Dual-Comb Laser and Its Application in Spectroscopy[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2021, 41(11): 3321-3330. |
| [10] |
ZHANG Zhi-qi1, ZHAO Tong1, LIU Ling1, LI Yan1,2*. Spectral Characteristics of Madagascar Agates[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2021, 41(10): 3227-3232. |
| [11] |
WU Lu-yi, GAO Guang-zhen, LIU Xin, GAO Zhen-wei, ZHOU Xin, YU Xiong, CAI Ting-dong*. Study on the Calibration of Reflectivity of the Cavity Mirrors Used in Cavity Enhanced Absorption Spectroscopy[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2021, 41(09): 2945-2949. |
| [12] |
LI Qing-yuan, LI Jing, WEI Xin, SUN Mei-xiu*. Performance Evaluation of a Portable Breath Isoprene Analyzer Based on Cavity Ringdown Spectroscopy[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2021, 41(08): 2415-2419. |
| [13] |
YU Lei, WANG Ya-mei*. The Spectral Characteristics of “Edison” Pearls and Nucleated Pearls With Dyeing Treatment[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2021, 41(08): 2626-2632. |
| [14] |
LU Wei1, CAI Miao-miao1, ZHANG Qiang2, LI Shan3. Fast Classification Method of Black Goji Berry (Lycium Ruthenicum Murr.) Based on Hyperspectral and Ensemble Learning[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2021, 41(07): 2196-2204. |
| [15] |
SHI Qi1, DING Long1, LONG Hong-ming1,2*, CHUN Tie-jun1. Study on Catalytic Combustion of Dioxins From Iron Ore Sintering Flue Gas Over Ce-V-Ti Catalysts by XRD and FTIR[J]. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2021, 41(01): 327-332. |
|
|
|
|
